Bug 1673509 - part9 : skip some tests on OSX test-verify. r=chunmin

These two tests become easily failed on OSX test-verify, I have no idea why adding event order test would cause that. Before they failed intermittently [1] and they both perform fullscreen and PIP mode operation which I suspect as a reason. Considering tv is a tier2 test and the root cause might not in media control side, disable them on OSX WebRender test-verify.

[1]
https://bugzilla.mozilla.org/show_bug.cgi?id=1674245
https://bugzilla.mozilla.org/show_bug.cgi?id=1674240

Differential Revision: https://phabricator.services.mozilla.com/D97476

dom/media/mediacontrol/tests/browser/browser.ini

@@ -31,12 +31,14 @@ support-files =
 [browser_media_control_keys_event.js]
 [browser_media_control_main_controller.js]
 [browser_media_control_non_eligible_media.js]
+skip-if = verify && (os == 'mac') # bug 1673509
 [browser_media_control_playback_state.js]
 [browser_media_control_position_state.js]
 [browser_media_control_seekto.js]
 [browser_media_control_supported_keys.js]
 [browser_media_control_stop_timer.js]
 [browser_nosrc_and_error_media.js]
+skip-if = verify && (os == 'mac') # bug 1673509
 [browser_seek_captured_audio.js]
 [browser_stop_control_after_media_reaches_to_end.js]
 [browser_suspend_inactive_tab.js]