ref(cells): update RegionReplicaService rpc method callers to use cell_name

[lynnagara]

No description provided.

[github-actions]

Backend Test Failures

Failures on 3ebd269 in this run:

tests/sentry/models/test_apitoken.py::ApiTokenTest::test_handle_async_deletion_called — log

tests/sentry/models/test_apitoken.py:229: in test_handle_async_deletion_called
    mock_delete_replica.assert_called_once_with(
/opt/hostedtoolcache/Python/3.13.1/x64/lib/python3.13/unittest/mock.py:989: in assert_called_once_with
    return self.assert_called_with(*args, **kwargs)
/opt/hostedtoolcache/Python/3.13.1/x64/lib/python3.13/unittest/mock.py:977: in assert_called_with
    raise AssertionError(_error_message()) from cause
E   AssertionError: expected call not found.
E   Expected: delete_replicated_api_token(apitoken_id=20, region_name=<ANY>)
E     Actual: delete_replicated_api_token(apitoken_id=20, cell_name='testregion737575')