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)

4019 [image_picker] Fix rotation when camera is a source (cla: yes, p: image_picker, platform-ios)

4021 [image_picker] Reverted removal of camera permission request. (cla: yes, waiting for tree to go green, p: image_picker, platform-android)

4038 [image_picker] Cleaned up README example (cla: yes, waiting for tree to go green, p: image_picker)