Swift Testing for Unit Tests PART 1 (#5119)

* migrated a lot of unit tests to Swift Testing and added a new implementation for deferred fulfillment

more tests migration

Cleaned the code manually to establish some good patterns

more code improvements

some more code improvements

removed empty tests

update project

* more pr suggestions and cleanups

* removed the TestSetup pattern

* fixing claude not reusing tests

* pr suggestion + added indent rule to swiftformat so that we can prevent AIs to change that

UnitTests/Sources/MediaUploadingPreprocessorTests.swift

@@ -109,7 +109,7 @@ final class MediaUploadingPreprocessorTests: XCTestCase {
         XCTAssertEqual(optimizedVideoInfo.height, 720)
         XCTAssertEqual(optimizedVideoInfo.duration ?? 0, 30, accuracy: 100)
     }
-
+    
     func testPortraitMp4VideoProcessing() async {
         // Allow an increased execution time as we encode the video twice now.
         executionTimeAllowance = 180