[ftr] Speed up FTR code owner check (elastic#205093)

## Summary

Switch to one matcher w/ all code owner patterns rather than separate
matchers for each code owner pattern. Reduces the run time of
`scripts/check_ftr_code_owners.js` by ~10x.

### Before
```console
▶ node scripts/check_ftr_code_owners.js
 info Reading CODEOWNERS file
 info Checking ownership for 8653 test files (this will take a while)
 info Ownership check complete (took 18.89 s)
 succ All test files have a code owner. 🥳
```

#### After
```console
▶ node scripts/check_ftr_code_owners.js
 info Checked 8653 test files in 1.59s
 succ All test files have a code owner 🥳
```

packages/kbn-test/index.ts

@@ -69,8 +69,6 @@ export { getUrl } from './src/jest/get_url';
 
 export { runCheckJestConfigsCli } from './src/jest/run_check_jest_configs_cli';
 
-export { runCheckFtrCodeOwnersCli } from './src/functional_test_runner/run_check_ftr_code_owners';
-
 export { runJest } from './src/jest/run';
 
 export * from './src/kbn_archiver_cli';

packages/kbn-test/src/functional_test_runner/cli/code_owners.ts

@@ -0,0 +1,48 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+import { run } from '@kbn/dev-cli-runner';
+import { createFailError } from '@kbn/dev-cli-errors';
+import { getRepoFiles } from '@kbn/get-repo-files';
+import { getCodeOwnersEntries } from '@kbn/code-owners';
+import ignore from 'ignore';
+
+const TEST_DIRECTORIES = ['test', 'x-pack/test', 'x-pack/test_serverless'];
+
+export async function checkFTRCodeOwnersCLI() {
+  await run(
+    async ({ log }) => {
+      const matcher = ignore().add(
+        getCodeOwnersEntries()
+          .filter((entry) => entry.teams.length > 0)
+          .map((entry) => entry.pattern)
+      );
+      const hasOwner = (path: string): boolean => matcher.test(path).ignored;
+
+      const testFiles = await getRepoFiles(TEST_DIRECTORIES);
+      const filesWithoutOwner = testFiles
+        .filter((repoPath) => !hasOwner(repoPath.repoRel))
+        .map((repoPath) => repoPath.repoRel);
+
+      log.info(`Checked ${testFiles.length} test files in ${process.uptime().toFixed(2)}s`);
+
+      if (filesWithoutOwner.length === 0) {
+        log.success(`All test files have a code owner 🥳`);
+        return;
+      }
+
+      log.write('Test files without a code owner:');
+      log.write(filesWithoutOwner.map((i) => ` - ${i}`).join('\n'));
+      throw createFailError(`Found ${filesWithoutOwner.length} test files without code owner`);
+    },
+    {
+      description: 'Check that all test files are covered by GitHub CODEOWNERS',
+    }
+  );
+}

packages/kbn-test/src/functional_test_runner/cli.ts → packages/kbn-test/src/functional_test_runner/cli/ftr.ts

@@ -16,8 +16,8 @@ import { ToolingLog } from '@kbn/tooling-log';
 import { getTimeReporter } from '@kbn/ci-stats-reporter';
 import exitHook from 'exit-hook';
 
-import { readConfigFile, EsVersion } from './lib';
-import { FunctionalTestRunner } from './functional_test_runner';
+import { readConfigFile, EsVersion } from '../lib';
+import { FunctionalTestRunner } from '../functional_test_runner';
 
 export function runFtrCli() {
   const runStartTime = Date.now();

packages/kbn-test/src/functional_test_runner/cli/index.ts

@@ -0,0 +1,11 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+export { runFtrCli } from './ftr';
+export { checkFTRCodeOwnersCLI } from './code_owners';

packages/kbn-test/src/functional_test_runner/index.ts

@@ -18,6 +18,6 @@ export {
   runCheckFtrConfigsCli,
   DedicatedTaskRunner,
 } from './lib';
-export { runFtrCli } from './cli';
+export * from './cli';
 export * from './lib/docker_servers';
 export * from './public_types';

scripts/check_ftr_code_owners.js

@@ -8,4 +8,4 @@
  */
 
 require('../src/setup_node_env');
-require('@kbn/test').runCheckFtrCodeOwnersCli();
+void require('@kbn/test').checkFTRCodeOwnersCLI();