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.

src/functions/get-sort-field.ts

@@ -3,6 +3,6 @@ export function getSortField(sortOption: sortOptions): sortOptions {
   return sortOption === 'updated'
     ? 'updated'
     : sortOption === 'comments'
-    ? 'comments'
-    : 'created';
+      ? 'comments'
+      : 'created';
 }