chore: rename converged_infra tag to platform_engineering (#799)

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

Author: 3 people

ibm_catalog.json

@@ -11,7 +11,7 @@
         "solution",
         "compute",
         "reference_architecture",
-        "converged_infra"
+        "platform_engineering"
       ],
       "keywords": [
         "vpc",