chore: optimize process scripts to adhere to guardrails

tools/optimizer/metrics/scripts/test_flakiness.js

@@ -0,0 +1,17 @@
+import { execSync } from 'node:child_process';
+
+try {
+  const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000);
+  const dateString = sevenDaysAgo.toISOString().split('T')[0];
+  
+  const output = execSync(`gh run list --status failure --limit 1000 --json databaseId --created ">=${dateString}"`, { encoding: 'utf-8' });
+  const runs = JSON.parse(output);
+  process.stdout.write(JSON.stringify({
+    metric: 'test_flakiness',
+    value: runs.length,
+    timestamp: new Date().toISOString()
+  }));
+} catch (err) {
+  process.stderr.write(err.message);
+  process.exit(1);
+}