Delete happy-pancakes.yml (#27955)

I'm not going to get a chance to finish this for a while, so delete for now.

.github/workflows/happy-pancakes.yml

@@ -1,74 +0,0 @@
-name: Happy Pancakes
-on:
-  pull_request:
-    types: [opened, edited, labeled, unlabeled, synchronize, ready_for_review, auto_merge_enabled, auto_merge_disabled]
-jobs:
-  check_status:
-    name: Check Required Status or force-merge label
-    runs-on: ubuntu-latest
-    steps:
-      # Cancel current runs if they're still running
-      # (saves processing on fast pushes)
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.9.1
-        with:
-          access_token: ${{ github.token }}
-      # Wait until our required statuses are ready or failed
-      # Unless force-merge is present, and then just be good.
-      - name: Check Status
-        uses: actions/github-script@v4
-        with:
-          script: |
-            function sleep(ms) {
-              return new Promise(resolve => setTimeout(resolve, ms));
-            }
-            let pull = await github.pulls.get({
-              owner: "grpc",
-              repo: "grpc",
-              pull_number: ${{ github.event.pull_request.number }}
-            });
-            for (var i = 0; i < pull.data.labels.length; i++) {
-              let label = pull.data.labels[i];
-              if (label.name == "force-merge") {
-                console.log("Saw force-merge label");
-                return;
-              }
-            }
-            while (true) {
-              var need = new Set();
-              need.add("Bazel Basic build for C/C++");
-              need.add("Portability Tests Linux [Build Only] (internal CI)");
-              for (var page=1;; page++) {
-                console.log("***** page " + page);
-                let statuses = await github.repos.listCommitStatusesForRef({
-                  owner: "grpc",
-                  repo: "grpc",
-                  ref: "${{ github.event.pull_request.head.sha }}",
-                  per_page: 100,
-                  page: page
-                });
-                for (var i = 0; i < statuses.data.length; i++) {
-                  let status = statuses.data[i];
-                  console.log(status.context, status.state, need);
-                  if (need.has(status.context)) {
-                    if (status.state == "success") {
-                      need.delete(status.context);
-                    } else if (status.state == "pending") {
-                      // do nothing
-                    } else {
-                      core.setFailed("Required status failed: " + status.context);
-                      return;
-                    }
-                  }
-                }
-                if (statuses.data.length < 100) {
-                  break;
-                }
-              }
-              if (need.size == 0) {
-                return;
-              }
-              // Sleep 15 minutes between polls
-              await sleep(15 * 60 * 1000);
-            }
-