3998 [path_provider] Add iOS unit tests (cla: yes, waiting for tree to go green, p: path_provider, platform-ios)

4003 [quick_actions] Optimised UI test to prevent flaky CI failures (cla: yes, p: quick_actions, platform-ios)

4005 Standardize XCTest locations and harnesses (cla: yes, p: webview_flutter, p: camera, p: google_sign_in, p: image_picker, p: in_app_purchase, p: local_auth, platform-ios)

4010 [camera] Do not trigger flat device orientation on iOS (cla: yes, p: camera, platform-ios)

4011 [shared_preferences] Add iOS unit tests (cla: yes, waiting for tree to go green, p: shared_preferences, platform-ios)