update azure.yml ref. to disable azure deploy for indexer service
- Indexer service's azure/m18-master branches causes issues in GLAB env. due to significant code changes from current master.
- Which in turn causes issues in indexing of newly ingested records in dev. env. effecting other services like dags, ddms etc.,
- This change disables azure deploy in azure/m18 master branch and it's respective child branches.
- However, one of the downside of this change is team can't test indexer service (for m18 branch) in glab env.
CC @nursheikh , @lucynliu