[run-webkit-tests] Add --skip-flaky-tests

[gsnedders]

201382a

[run-webkit-tests] Add --skip-flaky-tests
https://bugs.webkit.org/show_bug.cgi?id=263442

Reviewed by Jonathan Bedard.

Allow run-webkit-tests to skip flaky tests, primarily for the sake of
people rebaselining results.

* Tools/Scripts/webkitpy/layout_tests/controllers/manager.py:
(Manager._skip_tests):
* Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py:
(parse_args):
* Tools/Scripts/webkitpy/layout_tests/run_webkit_tests_integrationtest.py:
(RunTest.test_ews_corner_case_failing_directory):

Canonical link: https://commits.webkit.org/269573@main

c83b0fc

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
❌ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
✅ 🧪 webkitpy	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	🧪 gtk-wk2
	⏳ 🧪 api-ios	✅ 🧪 mac-wk2	🧪 api-gtk
	✅ 🛠 tv	🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
	✅ 🛠 watch
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash c83b0fc)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
❌ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
✅ 🧪 webkitpy	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	🧪 gtk-wk2
	⏳ 🧪 api-ios	✅ 🧪 mac-wk2	🧪 api-gtk
	✅ 🛠 tv	🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
	✅ 🛠 watch
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 269573@main (201382a): https://commits.webkit.org/269573@main

Reviewed commits have been landed. Closing PR #19340 and removing active labels.