Convert scripts/Gulpfile to checked mjs/cjs so they can run without compilation (#50988)

scripts/run-sequence.mjs

@@ -0,0 +1,21 @@
+import assert from "assert";
+import cp from "child_process";
+
+/**
+ * @param {[string, string[]][]} tasks
+ * @param {cp.SpawnSyncOptions} opts
+ * @returns {string}
+ */
+export function runSequence(tasks, opts = { timeout: 100000, shell: true }) {
+    let lastResult;
+    for (const task of tasks) {
+        console.log(`${task[0]} ${task[1].join(" ")}`);
+        const result = cp.spawnSync(task[0], task[1], opts);
+        if (result.status !== 0) throw new Error(`${task[0]} ${task[1].join(" ")} failed: ${result.stderr && "stderr: " + result.stderr.toString()}${result.stdout && "\nstdout: " + result.stdout.toString()}`);
+        console.log(result.stdout && result.stdout.toString());
+        lastResult = result;
+    }
+    const out = lastResult?.stdout?.toString();
+    assert(out !== undefined);
+    return out;
+}