Add logging for fusion feature flag updates

Add success log messages after updating fusion-rebalances and
fusion-fallback-replace feature flags in CapellaUtils to provide
confirmation of successful operations.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
Change-Id: Ia9e0f8aeada63cac6a5c582ddf0714841882df85
Reviewed-on: https://review.couchbase.org/c/TAF/+/243523
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Thuan Nguyen <soccon@gmail.com>

Author: ritalrw

couchbase_utils/capella_utils/dedicated.py

@@ -785,10 +785,13 @@ def update_fusion_feature_flag(pod, tenant):
                                       format(resp.status_code))
             raise Exception("Updating Fusion Feature Flag failed: {}".
                             format(resp.content))
+        CapellaUtils.log.info("Updated the fusion-rebalances feature flag successfully")
         resp = capella_api.update_global_feature_flag("fusion-fallback-replace", {"value": True})
         if resp.status_code != 204:
             CapellaUtils.log.critical("Updating Fusion Feature \
                                        Flag fusion-fallback-replace failed for cluster {}".
                                       format(resp.status_code))
             raise Exception("Updating Fusion Feature Flag failed: {}".
                             format(resp.content))
+        CapellaUtils.log.info("Updated the fusion-fallback-replace feature flag successfully")
+        return