Fix reporting success in create_variants.yml (#2714)

Task/Issue URL: https://app.asana.com/0/1199230911884351/1207192089896666/f

Description:
Always fetch Mattermost message template from main branch.

.github/workflows/create_variants.yml

@@ -143,7 +143,7 @@ jobs:
           GH_TOKEN: ${{ github.token }}
           WORKFLOW_URL: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}
         run: |
-          curl -fLSs $(gh api https://api.github.com/repos/${{ github.repository }}/contents/scripts/assets/variants-release-mm-template.json?ref=${{ github.ref }} --jq .download_url) \
+          curl -fLSs $(gh api https://api.github.com/repos/${{ github.repository }}/contents/scripts/assets/variants-release-mm-template.json --jq .download_url) \
               --output message-template.json
     
           export MM_USER_HANDLE=$(base64 -d <<< ${{ secrets.MM_HANDLES_BASE64 }} | jq ".${{ github.actor }}" | tr -d '"')