fix(forntend): generate UI coverage again (#12066)

* Attempt to fix UI coverage

* Update CI workflows:

- use test sharding
- Only upload coverage on master

* Restore line

* Simplify test

* Simplify test matrix

* Fix env vars

* Adjust matrix

* Adjust output names

* Fix paths

* Simplify qc_checks

* Revert missing line

* Simplify coverage calls

* Run firefox test against port 8000

* Fix VITE_COVERAGE env var

* Capture browser name in report output

* Increase timeout again

* Enhanced feedback from playwright startup

* Split UI checks into separate file

* Fix workflow deps

* Shard chromium build

* Adjust reporter type

* Reduce uncessesary build steps

* Tweak paths filter

* Reduce retries

* Also generate HTML reports

* Tweak reporter output

* Fix custom splash URLs

* Fix envs for customization tests

* Shard the firefox runner too

* Ignore customization tests for firefox too

* Don't upload if tests fail

* Fix triggers

* Remove merged test coverage

* Pin download action

* Error if no artifact files found

* Update ignore dirs

* Adjust baseFixtures

* Fix for teardown in baseFixtures.ts

* Fix path for coverage files

* include hidden files

src/frontend/tests/pui_forms.spec.ts

@@ -1,6 +1,6 @@
-/** Unit tests for form validation, rendering, etc */
-import { expect, test } from 'playwright/test';
 import { createApi } from './api';
+/** Unit tests for form validation, rendering, etc */
+import { expect, test } from './baseFixtures';
 import { stevenuser } from './defaults';
 import { navigate } from './helpers';
 import { doCachedLogin } from './login';