refactor: update imports to use ES module syntax and improve test structure (#1350)

- Changed import statements across multiple files to use the .js extension for ES module compatibility.
- Refactored test files to utilize jest's unstable_mockModule for mocking core actions.
- Removed unnecessary spy instances in tests, replacing them with direct mocked function calls.
- Updated TypeScript configuration to target ES2022 and use NodeNext module resolution.
- Removed the tsconfig.spec.json file and adjusted the main tsconfig.json to exclude test files.

.licenses/npm/content-type.dep.yml

@@ -0,0 +1,47 @@
+---
+name: content-type
+version: 2.0.0
+type: npm
+summary: Create and parse HTTP Content-Type header
+homepage:
+license: mit
+licenses:
+- sources: LICENSE
+  text: |
+    (The MIT License)
+
+    Copyright (c) 2015 Douglas Christopher Wilson
+
+    Permission is hereby granted, free of charge, to any person obtaining
+    a copy of this software and associated documentation files (the
+    'Software'), to deal in the Software without restriction, including
+    without limitation the rights to use, copy, modify, merge, publish,
+    distribute, sublicense, and/or sell copies of the Software, and to
+    permit persons to whom the Software is furnished to do so, subject to
+    the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+- sources: README.md
+  text: |-
+    [MIT](LICENSE)
+
+    [npm-image]: https://img.shields.io/npm/v/content-type
+    [npm-url]: https://npmjs.org/package/content-type
+    [downloads-image]: https://img.shields.io/npm/dm/content-type
+    [downloads-url]: https://npmjs.org/package/content-type
+    [build-image]: https://img.shields.io/github/actions/workflow/status/jshttp/content-type/ci.yml?branch=master
+    [build-url]: https://github.com/jshttp/content-type/actions/workflows/ci.yml?query=branch%3Amaster
+    [coverage-image]: https://img.shields.io/codecov/c/gh/jshttp/content-type
+    [coverage-url]: https://codecov.io/gh/jshttp/content-type
+    [license-image]: http://img.shields.io/npm/l/content-type.svg?style=flat
+    [license-url]: LICENSE
+notices: []