IGNITE-27651 Clean up direct tx on client disconnect

[ptupitsyn]

Store remote enlistments in client resource registry and clean up on disconnect.

https://issues.apache.org/jira/browse/IGNITE-27651

[Copilot]

Pull request overview

Adds server-side tracking of direct-transaction partition enlistments per client connection so that write intents/locks can be discarded when the client disconnects, and updates supporting utilities/tests/docs.

Changes:

• Expose RemotelyTriggeredResourceRegistry via TxManager and wire it through TxManagerImpl.
• Track direct-tx enlistments in ClientResourceRegistry and trigger cleanup on registry close (disconnect); refactor discard request cleanup into a helper.
• Add/enable integration tests and update client-side notes/utilities related to disconnect/cleanup behavior.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
modules/transactions/src/main/java/org/apache/ignite/internal/tx/impl/TxManagerImpl.java	Stores and exposes RemotelyTriggeredResourceRegistry from TxManagerImpl.
modules/transactions/src/main/java/org/apache/ignite/internal/tx/TxManager.java	Adds resourceRegistry() accessor to TxManager.
modules/runner/src/integrationTest/java/org/apache/ignite/internal/runner/app/client/ItThinClientTransactionCleanupTest.java	New IT validating that locks are released after thin client disconnect.
modules/jdbc/src/integrationTest/java/org/apache/ignite/jdbc/ItJdbcConnectionFailoverTest.java	Re-enables a transaction failover test and updates expected error text.
modules/core/src/main/java/org/apache/ignite/internal/util/ExceptionUtils.java	Moves a throwable de-duplication helper into core utilities.
modules/client/src/test/java/org/apache/ignite/client/fakes/FakeTxManager.java	Implements new TxManager.resourceRegistry() method for test fake.
modules/client/src/main/java/org/apache/ignite/internal/client/tx/DEVNOTES.md	Adds documentation for client direct transaction coordinator behavior.
modules/client/src/main/java/org/apache/ignite/internal/client/tx/ClientTransaction.java	Updates discard behavior note when channel is lost.
modules/client/src/main/java/org/apache/ignite/internal/client/ClientFutureUtils.java	Uses ExceptionUtils.existingCauseOrSuppressed via static import.
modules/client-handler/src/main/java/org/apache/ignite/client/handler/requests/tx/ClientTxPartitionEnlistmentCleaner.java	New helper to collect and discard local write intents for enlisted partitions.
modules/client-handler/src/main/java/org/apache/ignite/client/handler/requests/tx/ClientTransactionDiscardRequest.java	Refactors discard logic to use ClientTxPartitionEnlistmentCleaner.
modules/client-handler/src/main/java/org/apache/ignite/client/handler/requests/table/ClientTableCommon.java	Adds enlistment tracking and deregistration hook on tx finish for direct mapping.
modules/client-handler/src/main/java/org/apache/ignite/client/handler/ClientResourceRegistry.java	Tracks tx cleaners per connection and runs cleanup on registry close (disconnect).

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