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

compound-ios/Tests/CompoundTests/PreviewTests.swift

@@ -12,7 +12,7 @@ import Combine
 import SwiftUI
 import Testing
 
-@Suite(.serialized)
+@Suite
 struct PreviewTests {
     private struct SnapshotDevice {
         let name: String