chore: remove manual trigger from internal release workflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Devesh-Skyflow

.github/workflows/internal-release.yml

@@ -1,7 +1,6 @@
 name: Internal Release
 
 on:
-  workflow_dispatch:
   push:
     tags-ignore:
       - '*.*'