[fix] Remove debug push trigger from release-api-changelogs workflow

Remove the push trigger for sno-api-changelog branch that was added
for testing purposes. The workflow now only runs on successful completion
of the Release NPM Types workflow. Also simplify the PR base branch
to always target main.

.github/workflows/release-api-changelogs.yaml

@@ -5,9 +5,6 @@ on:
     workflows: ['Release NPM Types']
     types:
       - completed
-  push:
-    branches:
-      - sno-api-changelog
 
 concurrency:
   group: release-api-changelogs-${{ github.workflow }}
@@ -17,8 +14,8 @@ jobs:
   generate_changelog:
     name: Generate API Changelog
     runs-on: ubuntu-latest
-    # Only run on successful completion of the Release NPM Types workflow or on push to sno-api-changelog
-    if: ${{ github.event_name == 'push' || github.event.workflow_run.conclusion == 'success' }}
+    # Only run on successful completion of the Release NPM Types workflow
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     permissions:
       contents: write
       pull-requests: write
@@ -195,7 +192,7 @@ jobs:
             ---
             🤖 Generated with [Claude Code](https://claude.com/claude-code)
           branch: api-changelog-v${{ steps.current_version.outputs.version }}
-          base: ${{ github.event_name == 'push' && github.ref_name || 'main' }}
+          base: main
           labels: documentation
           delete-branch: true
           draft: true