Refactor MixedBulkWriteOperation to simplify retry logic there

[stIncMale]

For reviewers

I recommend reviewing the changes commit by commit. Review the sync code changes to assess the correctness compared to the pre-PR code. Then review the async code changes to assess whether the sync code was correctly translated into the async code.

AI usage

All the changes were handmade. AI was used only to review the changes.

JAVA-6218

[Copilot]

Pull request overview

This PR refactors MixedBulkWriteOperation retry handling to use per-batch RetryState instances and shared retry helpers, while updating related helper APIs, tests, and async control-flow conventions.

Changes:

• Reworks mixed bulk write sync/async retry flow and removes the custom bulk-write retry tracker.
• Updates shared retry/helper APIs and callers for source/connection handling and retry failure bookkeeping.
• Adjusts functional/unit tests and shared test utilities to reflect the new retry/resource lifecycle.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
driver-core/src/main/com/mongodb/internal/operation/MixedBulkWriteOperation.java	Refactors bulk write batching, retry, async execution, and resource holder logic.
driver-core/src/main/com/mongodb/internal/operation/SyncOperationHelper.java	Reorders withSourceAndConnection parameters and updates retry failure handling.
driver-core/src/main/com/mongodb/internal/operation/AsyncOperationHelper.java	Updates async retry failure handling and helper signatures.
driver-core/src/main/com/mongodb/internal/operation/CommandOperationHelper.java	Renames retry-label helper and passes server deprioritization directly.
driver-core/src/main/com/mongodb/internal/operation/ClientBulkWriteOperation.java	Aligns helper usage and async control flow with the refactored retry helpers.
driver-core/src/main/com/mongodb/internal/operation/retry/AttachmentKeys.java	Removes obsolete bulk write tracker attachment key.
driver-core/src/main/com/mongodb/internal/async/function/RetryState.java	Removes external last-attempt marking API.
driver-core/src/main/com/mongodb/internal/async/AsyncRunnable.java	Documents MutableValue usage in async lambdas.
driver-core/src/main/com/mongodb/internal/operation/FindOperation.java	Updates withSourceAndConnection call signature.
driver-core/src/main/com/mongodb/internal/operation/ListCollectionsOperation.java	Updates withSourceAndConnection call signature.
driver-core/src/main/com/mongodb/internal/operation/ListIndexesOperation.java	Updates withSourceAndConnection call signature.
driver-core/src/test/functional/com/mongodb/OperationFunctionalSpecification.groovy	Adds configurable expected connection release counts.
driver-core/src/test/functional/com/mongodb/internal/operation/MixedBulkWriteOperationSpecification.groovy	Updates mixed bulk write retry expectations.
driver-core/src/test/unit/com/mongodb/internal/async/function/RetryStateTest.java	Removes tests for deleted markAsLastAttempt.
driver-sync/src/test/functional/com/mongodb/client/MongoWriteConcernWithResponseExceptionTest.java	Refactors test for sync/reactive reuse and failpoint listener utility.
driver-sync/src/test/functional/com/mongodb/client/FailPoint.java	Makes failpoint guard close idempotent.
driver-reactive-streams/src/test/functional/com/mongodb/reactivestreams/client/MongoWriteConcernWithResponseExceptionTest.java	Reuses sync test through reactive sync adapter override.

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[stIncMale]

The code is so good that Copilot failed to find anything! 💪 😃

[stIncMale]

@stIncMale TODO Change to RetryableWriteError. Search for other occurrences in this PR.