CI: fix changelog push error (#90971)

* add --set-upstream origin to release-pr workflow git push

* use a different branch name for the changelog workflow

* disable backport support for now

* remove backport condition

.github/workflows/release-pr.yml

@@ -126,7 +126,7 @@ jobs:
 
       - name: Git push
         if: ${{ inputs.dry_run }} != true
-        run: git push
+        run: git push --set-upstream origin release/${{ github.run_id }}/${{ inputs.version }}
 
       - name: Create PR without backports
         if: "${{ inputs.backport == '' }}"
@@ -145,7 +145,6 @@ jobs:
         run: >
           gh pr create \
             $( [ "x${{ inputs.latest }}" == "xtrue" ] && printf %s '-l "release/latest"') \
-            -l "backport ${{ inputs.backport }}" \
             -l "product-approved" \
             --dry-run=${{ inputs.dry_run }} \
             -B "${{ inputs.target }}" \