chore: rename converged_infra tag to platform_engineering (#136)

Co-authored-by: Harika-Ponna <[email protected]>

Author: HarikaPonna

ibm_catalog.json

@@ -10,7 +10,7 @@
         "terraform",
         "solution",
         "logging_monitoring",
-        "converged_infra"
+        "platform_engineering"
       ],
       "keywords": [
         "IaC",