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/ChatsTabFlowCoordinatorTests.swift

@@ -24,7 +24,7 @@ class ChatsTabFlowCoordinatorTests: XCTestCase {
     var detailCoordinator: CoordinatorProtocol? {
         splitCoordinator?.detailCoordinator
     }
-
+    
     var detailNavigationStack: NavigationStackCoordinator? {
         detailCoordinator as? NavigationStackCoordinator
     }