Improve tests' reliability (#763)

* Create publisher extension into the unit test target

* Add ViewModelContext test extension

* Refactor BugReportViewModelTests

* Fix failing UTs

* Idea PublishedClosure

* Refactor RoomDetailsViewModelTests

* Replace more Task.yield/Task.sleep

* Move leaveRoom/ignore/unignore under the @MainActor

* Revert "Idea PublishedClosure"

This reverts commit 4ab25291041f0dbd99083baf9d95bc6647f1fd97.

* Make process(viewAction:) sync

* Refactor BugReportViewModel callback to a publisher

* Fix UTs

* Refactor ReportContentViewModel

* Fix ui test build error

* Try make sonar happy

* Empty commit

* Revert "Try make sonar happy"

This reverts commit 97804b19373a8f55f12174ccbf27f1fd8db583b7.

* Rename ui test identifier

* Cleanup

* Callback -> actions refactor

* Update template

* Add publisher in TemplateCoordinator

* Add env variable in IntegrationTests.xctestplan

* Add async sequence extension

* Amend integration test plan

* Remove env variable from target.yml

* Cleanup

* Fix failing UI tests

ElementX/Sources/Other/Extensions/Publisher.swift

@@ -23,17 +23,3 @@ extension Publisher where Self.Failure == Never {
         }
     }
 }
-
-extension Published.Publisher {
-    /// Returns the next output from the publisher skipping the current value stored into it (which is readable from the @Published property itself).
-    /// - Returns: the next output from the publisher
-    var nextValue: Output? {
-        get async {
-            var iterator = values.makeAsyncIterator()
-            
-            // skips the publisher's current value
-            _ = await iterator.next()
-            return await iterator.next()
-        }
-    }
-}

ElementX/Sources/Other/SwiftUI/ViewModel/StateStoreViewModel.swift

@@ -89,14 +89,14 @@ class StateStoreViewModel<State: BindableState, ViewAction> {
             .sink { [weak self] action in
                 guard let self else { return }
 
-                Task { await self.process(viewAction: action) }
+                self.process(viewAction: action)
             }
             .store(in: &cancellables)
     }
 
     /// Override to handles incoming `ViewAction`s from the `ViewModel`.
     /// - Parameter viewAction: The `ViewAction` to be processed in `ViewModel` implementation.
-    func process(viewAction: ViewAction) async {
+    func process(viewAction: ViewAction) {
         // Default implementation, -no-op
     }
 }