master: add v8.5.7 support info for performance_schema_session_connect_attrs_size

[ti-chi-bot]

This is an automated cherry-pick of #21577

This is an automated cherry-pick of #21468

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• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

This PR updates docs according to pingcap/tidb#66617:

• Add Session_connect_attrs (json) to the schema examples of INFORMATION_SCHEMA.SLOW_QUERY and INFORMATION_SCHEMA.CLUSTER_SLOW_QUERY.
• Add the system variable doc for performance_schema_session_connect_attrs_size (default/range/-1 behavior/truncation/1 MiB hard limit note).
• Add status variable docs:
  • Performance_schema_session_connect_attrs_longest_seen
  • Performance_schema_session_connect_attrs_lost
• Update SESSION_CONNECT_ATTRS doc with size limit and truncation behavior.

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By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

What is the related PR or file link(s)?

• This PR is translated from: docs: support logging session connect attrs to slow query log  docs#22547
  • *: support logging session connect attrs to slow query log tidb#66617
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

@ti-chi-bot This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

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[qiancai]

/approve

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