Update Build Web workflow to only run on published Web releases. Removed migrated Staged Rollout Desktop workflow. (#20761)

Author: vgrassia

.github/workflows/build-web.yml

@@ -56,8 +56,31 @@ permissions:
   contents: read
 
 jobs:
+  check-release-tag:
+    name: Check release tag
+    if: github.event_name == 'release'
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check tag
+        env:
+          TAG_NAME: ${{ github.event.release.tag_name }}
+        run: |
+          if [[ "$TAG_NAME" == web-v* ]]; then
+            echo "### ✅ Web release detected" >> "$GITHUB_STEP_SUMMARY"
+            echo "Tag \`$TAG_NAME\` matches \`web-v*\`. Proceeding with build." >> "$GITHUB_STEP_SUMMARY"
+          else
+            echo "### ⏭️ Build skipped" >> "$GITHUB_STEP_SUMMARY"
+            echo "Tag \`$TAG_NAME\` does not match \`web-v*\`. This release is not for Web, skipping." >> "$GITHUB_STEP_SUMMARY"
+          fi
+
   setup:
     name: Setup
+    needs: check-release-tag
+    if: |
+      always()
+      && (needs.check-release-tag.result == 'skipped'
+        || (needs.check-release-tag.result == 'success'
+          && startsWith(github.event.release.tag_name, 'web-v')))
     runs-on: ubuntu-24.04
     outputs:
       version: ${{ steps.version.outputs.value }}