Add result_backend_transport_options for Redis Sentinel support in Celery

[harshith-21]

Currently, Airflow only supports Redis Sentinel for the Celery broker via [celery_broker_transport_options]. This PR adds the equivalent [celery_result_backend_transport_options] section to support Redis Sentinel as the result backend, including sentinel_kwargs and master_name configuration options.

With these changes i was able to use redis sentinel for result_backend for celery.

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[boring-cyborg]

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[harshith-21]

@potiuk could you please help review this PR when you get a chance?
Looping in @hussein-awala as well. Thank you!

[potiuk]

static checks to fix

[harshith-21]

@potiuk @hussein-awala please help me rerun those workflows, made more changes to fix workflow errors

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.