Revert "[Internal] Add experimental tag"

This reverts commit 920b835.

Author: avijeet95

.codegen/changelog_config.yml

@@ -7,8 +7,6 @@ change_types:
     tag: "[Doc]"
   - message: Internal Changes
     tag: "[Internal]"
-  - message: Experimental Changes
-    tag: "[Experimental]"
   # Does not appear in the Changelog. Only for PR validation.
   - message: Release
     tag: "[Release]"