Terminate app in between UI tests and reset Simulator on launch (#17919)

This is an attempt to address certain flakiness issues. See also #17886 for more details on the rationale for the changes.

All credits to @pachlava.

Co-authored-by: pachlava <pachlava@gmail.com>

Author: mokagio

WordPress/WordPressUITests/Utils/XCTest+Extensions.swift

@@ -10,6 +10,7 @@ extension XCTestCase {
         continueAfterFailure = false
 
         let app = XCUIApplication()
+        app.terminate()
         app.launchArguments = ["-wpcom-api-base-url", WireMock.URL().absoluteString, "-no-animations", "-ui-testing"]
         app.activate()
 

fastlane/Fastfile

@@ -961,6 +961,7 @@ platform :ios do
       test_without_building: true,
       xctestrun: test_plan_path,
       output_directory: File.join(PROJECT_ROOT_FOLDER, 'build', 'results'),
+      reset_simulator: true,
       result_bundle: true
     )
   end