🗂️ refactor: Migrate S3 Storage to TypeScript in packages/api (#11947)

* Migrate S3 storage module with unit and integration tests

  - Migrate S3 CRUD and image operations to packages/api/src/storage/s3/
  - Add S3ImageService class with dependency injection
  - Add unit tests using aws-sdk-client-mock
  - Add integration tests with real s3 bucket (condition presence of  AWS_TEST_BUCKET_NAME)

* AI Review Findings Fixes

* chore: tests and refactor S3 storage types

- Added mock implementations for the 'sharp' library in various test files to improve image processing testing.
- Updated type references in S3 storage files from MongoFile to TFile for consistency and type safety.
- Refactored S3 CRUD operations to ensure proper handling of file types and improve code clarity.
- Enhanced integration tests to validate S3 file operations and error handling more effectively.

* chore: rename test file

* Remove duplicate import of refreshS3Url

* chore: imports order

* fix: remove duplicate imports for S3 URL handling in UserController

* fix: remove duplicate import of refreshS3FileUrls in files.js

* test: Add mock implementations for 'sharp' and '@librechat/api' in UserController tests

- Introduced mock functions for the 'sharp' library to facilitate image processing tests, including metadata retrieval and buffer conversion.
- Enhanced mocking for '@librechat/api' to ensure consistent behavior in tests, particularly for the needsRefresh and getNewS3URL functions.

---------

Co-authored-by: Danny Avila <danny@librechat.ai>

api/server/routes/files/files.agents.test.js

@@ -39,7 +39,16 @@ jest.mock('~/server/services/Tools/credentials', () => ({
   loadAuthValues: jest.fn(),
 }));
 
-jest.mock('~/server/services/Files/S3/crud', () => ({
+jest.mock('sharp', () =>
+  jest.fn(() => ({
+    metadata: jest.fn().mockResolvedValue({}),
+    toFormat: jest.fn().mockReturnThis(),
+    toBuffer: jest.fn().mockResolvedValue(Buffer.alloc(0)),
+  })),
+);
+
+jest.mock('@librechat/api', () => ({
+  ...jest.requireActual('@librechat/api'),
   refreshS3FileUrls: jest.fn(),
 }));