Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/import-in-the-middle/test/generic-loader.mjs

@@ -0,0 +1,14 @@
+// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2.0 License.
+//
+// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2024 Datadog, Inc.
+
+import * as tsLoader from './typescript/iitm-ts-node-loader.mjs'
+import * as regularLoader from '../hook.mjs'
+import path from 'path'
+
+const filename = process.env.IITM_TEST_FILE
+
+export const { initialize, load, resolve, getFormat, getSource } =
+  filename.includes('disabled') || filename.includes('register')
+    ? {}
+    : (path.extname(filename).slice(-2) === 'ts' ? tsLoader : regularLoader)