chore(ansible): suffix postgres_release with _utk_test to avoid AMI name collisions

Prevents repeated 'AMI Name already in use' failures during workflow-dispatch
builds off this PR branch by namespacing all three release strings.

To revert before merging:
  postgresorioledb-17: 17.6.0.089-orioledb_utk_test -> 17.6.0.NNN-orioledb
  postgres17:          17.10.1.001_utk_test         -> 17.10.1.001
  postgres15:          15.18.1.001_utk_test         -> 15.18.1.001

Refs: PSQL-1233

Author: utkarash2991

ansible/vars.yml

@@ -10,9 +10,9 @@ postgres_major:
 
 # Full version strings for each major version
 postgres_release:
-  postgresorioledb-17: "17.6.0.088-orioledb"
-  postgres17: "17.10.1.001"
-  postgres15: "15.18.1.001"
+  postgresorioledb-17: "17.6.0.089-orioledb_utk_test"
+  postgres17: "17.10.1.001_utk_test"
+  postgres15: "15.18.1.001_utk_test"
 
 # Non Postgres Extensions
 pgbouncer_release: 1.25.1