[fix][broker] Cancel queued transaction snapshot recovery on topic close

[Demogorgon314]

Motivation

Transaction snapshot recovery tasks can remain queued after a topic is closed.
The queued task retains the snapshot processor, topic, and managed ledger,
causing closed topics to accumulate when topic loading is repeatedly retried.

Modifications

• Cancel queued snapshot recovery tasks when the transaction buffer closes.
• Wait for running recovery to stop before releasing snapshot resources.
• Prevent recovery from succeeding after close has started.
• Stop segmented recovery between I/O operations after close.
• Handle recovery task submission rejection asynchronously.
• Add tests for queued, running, completed, retried, and rejected recovery.

Topic close may now wait for an in-flight recovery I/O operation to finish before releasing snapshot resources.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment