Fix memory leak in caching execution information location, fixes #8623

[mattcasters]

Fixes #8623

Description

This PR addresses and fixes the memory leak observed when using the caching database (and file) execution information locations:

1. Bounded In-Memory LRU Cache:

   • Replaced unbounded HashMap in BaseCachingExecutionInfoLocation with an access-order LinkedHashMap.
   • Added maxCacheSize metadata property and GUI widget (default: 50, order "905"), configurable in the metadata dialog.
   • Reduced maxCacheAge default from 24 hours to 10 minutes (600000 ms) and updated i18n tooltips and labels.
   • Implemented enforceMaxCacheSize() which evicts LRU entries and persists dirty entries prior to eviction.
   • Ensured close() clears the cache (finally { cache.clear(); }) and synchronized clearCaches().

2. Eliminated Immortal Unwritten Cache Entries:

   • In CacheEntry.isTooOld(), fixed the condition so entries fall back to creationDate when lastRead and lastWritten are null, preventing entries from lingering indefinitely.

3. Prevented PreparedStatement Collision & Statement Leak in retrieveIds():

   • In CachingDatabaseExecutionInfoLocation.retrieveIds(), collected parent IDs into a list first and closed the outer query/ResultSet before calling loadCacheEntry() for child executions, preventing statement overwrite and leak on Database.pstmt.
   • Reused a thread-safe Jackson ObjectMapper instance with HopJson.newMapper().

4. Resource Safety in Core Database:

   • In Database.insertRow(schemaName, tableName, fields, data), wrapped insert execution in try ... finally { closeInsert(); } to ensure prepared statements are always closed even on error.

5. Lifecycle and Execution Info Timer Hardening:

   • In Pipeline.fireExecutionFinishedListeners(), ensured pipelineCompleted(), extension point, and releaseVfsNamespace() are guaranteed to execute even if a listener throws an exception.
   • In LocalPipelineEngine, made stopTransformExecutionInfoTimer() synchronized and idempotent, stopped the timer on startup failure in startThreads(), and registered an execution-stopped listener to trigger timer/location cleanup.

6. Tests:

   • Added unit tests in CachingDatabaseExecutionInfoLocationTest:
     • lruCacheEvictionEnforcesMaxSize: verifies LRU eviction bounds memory at maxCacheSize while evicted entries remain persistent in the database.
     • closeClearsCacheMap: verifies memory cache is cleared on close().
     • retrieveIdsWithChildrenLoadsChildrenCorrectly: verifies child entry retrieval works without statement collisions.

---

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