CI: mark /build and /nightly command comment resolved when done (#31734)

.github/workflows/command-pr-build.yml

@@ -181,3 +181,13 @@ jobs:
               const body = [`Test binaries for the fix in #${num} are ready to test:`, '', ...artifacts].join('\n');
               await github.rest.issues.createComment({ owner, repo, issue_number, body });
             }
+
+      - name: Resolve command comment
+        uses: actions/github-script@v8
+        with:
+          script: |
+            // collapse the /build comment as resolved now that the build is done
+            await github.graphql(
+              `mutation($id:ID!){minimizeComment(input:{subjectId:$id,classifier:RESOLVED}){minimizedComment{isMinimized}}}`,
+              { id: context.payload.comment.node_id }
+            );