chore(pubsub): remove deprecated v2.x client code samples

[aandreassa]

Cleaning this up after ~1 year from #30663.

The google-cloud-pubsub/v2.x is no longer supported after this period.

Tracking b/394933060

[snippet-bot]

Here is the summary of changes.

You are about to delete 59 region tags.

• google-cloud-pubsub/v2samples/Gemfile:15, tag pubsub_old_version_dependencies
• google-cloud-pubsub/v2samples/Gemfile:23, tag pubsub_old_version_dependencies
• google-cloud-pubsub/v2samples/pubsub_commit_proto_schema.rb:18, tag pubsub_old_version_commit_proto_schema
• google-cloud-pubsub/v2samples/pubsub_create_avro_schema.rb:18, tag pubsub_old_version_create_avro_schema
• google-cloud-pubsub/v2samples/pubsub_create_bigquery_subscription.rb:15, tag pubsub_old_version_create_bigquery_subscription
• google-cloud-pubsub/v2samples/pubsub_create_proto_schema.rb:18, tag pubsub_old_version_create_proto_schema
• google-cloud-pubsub/v2samples/pubsub_create_pull_subscription.rb:18, tag pubsub_old_version_create_pull_subscription
• google-cloud-pubsub/v2samples/pubsub_create_push_subscription.rb:18, tag pubsub_old_version_create_push_subscription
• google-cloud-pubsub/v2samples/pubsub_create_subscription_with_exactly_once_delivery.rb:15, tag pubsub_old_version_create_subscription_with_exactly_once_delivery
• google-cloud-pubsub/v2samples/pubsub_create_subscription_with_filter.rb:15, tag pubsub_old_version_create_subscription_with_filter
• google-cloud-pubsub/v2samples/pubsub_create_topic.rb:18, tag pubsub_old_version_create_topic
• google-cloud-pubsub/v2samples/pubsub_create_topic_with_schema.rb:18, tag pubsub_old_version_create_topic_with_schema
• google-cloud-pubsub/v2samples/pubsub_dead_letter_create_subscription.rb:18, tag pubsub_old_version_dead_letter_create_subscription
• google-cloud-pubsub/v2samples/pubsub_dead_letter_delivery_attempt.rb:18, tag pubsub_old_version_dead_letter_delivery_attempt
• google-cloud-pubsub/v2samples/pubsub_dead_letter_remove.rb:18, tag pubsub_old_version_dead_letter_remove
• google-cloud-pubsub/v2samples/pubsub_dead_letter_update_subscription.rb:18, tag pubsub_old_version_dead_letter_update_subscription
• google-cloud-pubsub/v2samples/pubsub_delete_schema.rb:18, tag pubsub_old_version_delete_schema
• google-cloud-pubsub/v2samples/pubsub_delete_subscription.rb:18, tag pubsub_old_version_delete_subscription
• google-cloud-pubsub/v2samples/pubsub_delete_topic.rb:18, tag pubsub_old_version_delete_topic
• google-cloud-pubsub/v2samples/pubsub_detach_subscription.rb:18, tag pubsub_old_version_detach_subscription
• google-cloud-pubsub/v2samples/pubsub_enable_subscription_ordering.rb:18, tag pubsub_old_version_enable_subscription_ordering
• google-cloud-pubsub/v2samples/pubsub_get_schema.rb:18, tag pubsub_old_version_get_schema
• google-cloud-pubsub/v2samples/pubsub_get_subscription_policy.rb:18, tag pubsub_old_version_get_subscription_policy
• google-cloud-pubsub/v2samples/pubsub_get_topic_policy.rb:18, tag pubsub_old_version_get_topic_policy
• google-cloud-pubsub/v2samples/pubsub_list_schema_revisions.rb:18, tag pubsub_old_version_list_schema_revisions
• google-cloud-pubsub/v2samples/pubsub_list_schemas.rb:18, tag pubsub_old_version_list_schemas
• google-cloud-pubsub/v2samples/pubsub_list_subscriptions.rb:18, tag pubsub_old_version_list_subscriptions
• google-cloud-pubsub/v2samples/pubsub_list_topic_subscriptions.rb:18, tag pubsub_old_version_list_topic_subscriptions
• google-cloud-pubsub/v2samples/pubsub_list_topics.rb:18, tag pubsub_old_version_list_topics
• google-cloud-pubsub/v2samples/pubsub_publish.rb:18, tag pubsub_old_version_publish
• google-cloud-pubsub/v2samples/pubsub_publish_avro_records.rb:18, tag pubsub_old_version_publish_avro_records
• google-cloud-pubsub/v2samples/pubsub_publish_custom_attributes.rb:18, tag pubsub_old_version_publish_custom_attributes
• google-cloud-pubsub/v2samples/pubsub_publish_proto_messages.rb:19, tag pubsub_old_version_publish_proto_messages
• google-cloud-pubsub/v2samples/pubsub_publish_with_error_handler.rb:18, tag pubsub_old_version_publish_with_error_handler
• google-cloud-pubsub/v2samples/pubsub_publish_with_ordering_keys.rb:18, tag pubsub_old_version_publish_with_ordering_keys
• google-cloud-pubsub/v2samples/pubsub_publisher_batch_settings.rb:18, tag pubsub_old_version_publisher_batch_settings
• google-cloud-pubsub/v2samples/pubsub_publisher_concurrency_control.rb:18, tag pubsub_old_version_publisher_concurrency_control
• google-cloud-pubsub/v2samples/pubsub_publisher_flow_control.rb:18, tag pubsub_old_version_publisher_flow_control
• google-cloud-pubsub/v2samples/pubsub_publisher_with_compression.rb:15, tag pubsub_old_version_publisher_with_compression
• google-cloud-pubsub/v2samples/pubsub_quickstart_publisher.rb:18, tag pubsub_old_version_quickstart_publisher
• google-cloud-pubsub/v2samples/pubsub_resume_publish_with_ordering_keys.rb:18, tag pubsub_old_version_resume_publish_with_ordering_keys
• google-cloud-pubsub/v2samples/pubsub_set_subscription_policy.rb:18, tag pubsub_old_version_set_subscription_policy
• google-cloud-pubsub/v2samples/pubsub_set_topic_policy.rb:18, tag pubsub_old_version_set_topic_policy
• google-cloud-pubsub/v2samples/pubsub_subscribe_avro_records.rb:18, tag pubsub_old_version_subscribe_avro_records
• google-cloud-pubsub/v2samples/pubsub_subscribe_proto_messages.rb:19, tag pubsub_old_version_subscribe_proto_messages
• google-cloud-pubsub/v2samples/pubsub_subscriber_async_pull.rb:18, tag pubsub_old_version_subscriber_async_pull
• google-cloud-pubsub/v2samples/pubsub_subscriber_async_pull.rb:19, tag pubsub_old_version_quickstart_subscriber
• google-cloud-pubsub/v2samples/pubsub_subscriber_async_pull_custom_attributes.rb:18, tag pubsub_old_version_subscriber_async_pull_custom_attributes
• google-cloud-pubsub/v2samples/pubsub_subscriber_concurrency_control.rb:18, tag pubsub_old_version_subscriber_concurrency_control
• google-cloud-pubsub/v2samples/pubsub_subscriber_error_listener.rb:18, tag pubsub_old_version_subscriber_error_listener
• google-cloud-pubsub/v2samples/pubsub_subscriber_exactly_once_delivery.rb:15, tag pubsub_old_version_subscriber_exactly_once
• google-cloud-pubsub/v2samples/pubsub_subscriber_flow_settings.rb:18, tag pubsub_old_version_subscriber_flow_settings
• google-cloud-pubsub/v2samples/pubsub_subscriber_sync_pull.rb:18, tag pubsub_old_version_subscriber_sync_pull
• google-cloud-pubsub/v2samples/pubsub_subscriber_sync_pull_with_lease.rb:18, tag pubsub_old_version_subscriber_sync_pull_with_lease
• google-cloud-pubsub/v2samples/pubsub_test_subscription_permissions.rb:18, tag pubsub_old_version_test_subscription_permissions
• google-cloud-pubsub/v2samples/pubsub_test_topic_permissions.rb:18, tag pubsub_old_version_test_topic_permissions
• google-cloud-pubsub/v2samples/pubsub_update_push_configuration.rb:18, tag pubsub_old_version_update_push_configuration
• google-cloud-pubsub/v2samples/quickstart.rb:16, tag pubsub_old_version_quickstart_create_topic
• google-cloud-pubsub/v2samples/quickstart.rb:17, tag require_library

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