* Fix semaphore release logic in scheduled task execution
- Ensure `_executionSemaphore` is only released when acquired.
- Refactor `acquired` variable initialization for better reliability and readability across `ScheduledRecurringTask`, `ScheduledCronTask`, and `ScheduledSpecificInstantTask`.
* Fix test isolation in WorkflowDefinitionActivity cache eviction test (#7046)
* Add thread-safety and resource disposal to `WorkflowDefinitionActivity`
- Introduced `SemaphoreSlim` to ensure thread-safe initialization.
- Implemented `IDisposable` to clean up semaphore resources.
* Introduce thread-safety in `CacheManager` with per-key locking
- Added `ConcurrentDictionary` for managing per-key `SemaphoreSlim` instances.
- Ensured thread-safe `GetOrCreateAsync` operations with key-specific locks.
- Cleaned up unused locks when cache entries are removed.
* Add definition IDs filter to WorkflowDefinitionActivityTests
- Updated `WorkflowInstanceFilter` to include `DefinitionIds` for more precise faulted workflow filtering.
- Improved test coverage for workflow definition scenarios.
* Revert "Introduce thread-safety in `CacheManager` with per-key locking"
This reverts commit cda89d4e6aea1810364cdb0145a59d7b6448bc49.
* Revert "Add thread-safety and resource disposal to `WorkflowDefinitionActivity`"
This reverts commit 08750890a16a8b539941d6d161b4061d2fdbe1b8.
* Remove unnecessary whitespace in WorkflowDefinitionActivityTests
e2a1b83ec8