Add deferrable mode support to AzureBatchOperator (#66815)

* Add deferrable mode support to AzureBatchOperator by introducing
AzureBatchTrigger and delegating Azure Batch job monitoring to the
trigger when deferrable=True.

Implement execute_complete handling for success, timeout, failure,
and empty-task trigger events, with cleanup support for terminal
states.

Add unit tests covering trigger serialization, task state handling,
timeouts, mixed and empty task lists, exception handling, and
execute_complete event processing.

* Adjusted docs and end_time computation to reflect operator intent.

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Co-authored-by: Sameer Mesiah <smesiah971@gmail.com>