[fix][broker] Fix markDeletedPosition race condition in ManagedLedgerImpl.maybeUpdateCursorBeforeTrimmingConsumedLedger() method

[oneby-wang]

Motivation

We do mark delete operations in ManagedLedgerImpl.maybeUpdateCursorBeforeTrimmingConsumedLedger() after #25087.

Mark deleting an already mark-deleted position will throw an Exception.

Please see comment for race condition case: #25101 (comment).

See also:

1. [fix][test] Fix ManagedCursorTest and NonDurableCursorTest flaky tests #25101
2. [fix][test] Fix ManagedCursorTest and NonDurableCursorTest flaky tests #25101 (comment)

Modifications

1. Snapshot cursor.getMarkDeletedPosition() into a local variable to avoid race condition.
2. Add warn log when lastAckedPosition < markDeletedPosition.
3. Modify some typo, add one TODO.

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• Dependencies (add or upgrade a dependency)
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• The schema
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• The REST endpoints
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PR in forked repository: oneby-wang#18

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