[PUI] Add coverage testing (#6881)

* add coverage to PUI

* fix testing command

* always do all steps

* fix test assumptions

* add test for serving and logging into pui from django / cui tech stack

* fix up coverage

* fix intentation

* remove paralell flags

* remove coverage finish step

* remove flag

* change names

* add full clickdown test

* more tests

* more tests

* sprinkle in some timeouts

* try using admin

* disable page 1 tests for now

* remove additional tests for now

* only build sourcemaps if coverage is enabled

* fix sourcemap assumption

* Update .github/workflows/qc_checks.yaml

Co-authored-by: Lukas <76838159+wolflu05@users.noreply.github.com>

* fix package.json

* add finish step

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Co-authored-by: Lukas <76838159+wolflu05@users.noreply.github.com>

src/frontend/.gitignore

@@ -27,3 +27,5 @@ dist-ssr
 /test-results/
 /playwright-report/
 /playwright/.cache/
+/.nyc_output/
+/coverage/