UI test fixes (#335)

* Remove status bars when running UITests
* Remove simulator OS versions from screenshot names, be less lenient with image diffing
* Rename UITests splash screen to onboarding
* Switch tests to Xcode 14.1, remove version names for used simulators and switched from iPhone 13 Pro Max to iPhone 14
* Fix ServiceLocator and fallbackLaguage for UI tests
* Drop snapshot diffing precision to 0.99 as 0.999 triggers false negatives
* Fix server selection UI tests after exposing the sliding sync proxy configuration
* Update reference screenshots

fastlane/Fastfile

@@ -2,7 +2,7 @@ require 'yaml'
 require_relative 'changelog'
 
 before_all do
-  xcversion(version: "~> 14.0.1")
+  xcversion(version: "~> 14.1")
 end
 
 lane :alpha do
@@ -106,7 +106,7 @@ end
 lane :ui_tests do 
   run_tests(
     scheme: "UITests",
-    devices: ["iPhone 13 Pro Max (16.0)", "iPad (9th generation) (16.0)"],
+    devices: ["iPhone 14", "iPad (9th generation)"],
     ensure_devices_found: true,
     prelaunch_simulator: true,
     result_bundle: true