Add TaskMetadata for instantiation-free task introspection

[jamisonbryant]

Summary

Fixes the CI failures in dereuromark#470 where tasks with required DI constructor params cause ArgumentCountError when Config::taskConfig(), QueueController::index(), and QueueHelper try to read metadata via new $className().

• Add TaskMetadata class that reads property defaults (timeout, retries, rate, costs, unique) via ReflectionProperty::getDefaultValue() and description() via newInstanceWithoutConstructor() — no constructor invocation needed
• Update Config::taskConfig() and QueueController::index() to use TaskMetadata::fromClass() instead of direct instantiation
• Use is_subclass_of() for interface checks in QueueController::addJob() to avoid instantiating DI tasks

Test plan

• TaskMetadataTest — 3 tests covering property defaults, description, and DI constructor tasks
• Full test suite passes (161 tests, 0 failures)
• phpcs clean
• phpstan clean

[Copilot]

Pull request overview

Adds instantiation-free task introspection to avoid ArgumentCountError for tasks with required constructor DI params when the system reads task metadata (timeout/retries/rate/costs/unique/description).

Changes:

• Introduces Queue\Queue\TaskMetadata to read task property defaults via reflection and obtain description() without invoking constructors.
• Updates Config::taskConfig() and Admin\QueueController::index() to use TaskMetadata::fromClass() instead of new $className().
• Adds/updates tests and test-app fixtures to cover metadata introspection and DI-constructor tasks.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Queue/TaskMetadata.php	New reflection-based metadata reader to avoid task instantiation.
src/Queue/Config.php	Switches task config building to read metadata via TaskMetadata.
src/Controller/Admin/QueueController.php	Avoids instantiating tasks for descriptions; uses is_subclass_of() for interface checks before instantiation.
tests/TestCase/Queue/TaskMetadataTest.php	Adds coverage for property-default reading, description reading, and DI-constructor tasks.
tests/test_app/src/Queue/Task/MetadataTask.php	Test fixture task with explicit metadata defaults and description override.
tests/TestCase/Command/InfoCommandTest.php	Updates expected task count due to new test task fixture.

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