[bug] Playwright fixes (#9933)

* Fixes for playwright testing

- Ensure cookies are completely cleaned  between sessions
- Fix base URL based on vite command
- Fix samesite cookie mode
- Prevent /static/ files being served by web server on :8000

* Remove gunicorn option

* Readjust base URL

* Simplify doCachedLogin

* Fix logic func

* Revert webserver cmd

* Set base URL in playwrightconfig file

* Fix URL checks

* Fix URL definitions

* adjust playwright base URL

* Tweak for URL helper

* Further login tweaks

* Tweak test

* wait for API before starting tests

* Handle error

* Adjust login functions

* Don't use gunicorn

- But still use the webserver to serve static files in CI

* Enhanced login functions

* Tweak login tests

* Fix broken test

* Flipped the flippies

src/frontend/tests/pages/pui_part.spec.ts

@@ -265,7 +265,7 @@ test('Parts - Pricing (Nothing, BOM)', async ({ browser }) => {
   await page.getByRole('button', { name: 'Supplier Pricing' }).isDisabled();
 
   // Part with history
-  await navigate(page, 'part/108/pricing');
+  await navigate(page, 'part/108/pricing', { waitUntil: 'networkidle' });
   await page.getByText('A chair - with blue paint').waitFor();
   await loadTab(page, 'Part Pricing');
   await page.getByLabel('Part Pricing').getByText('Part Pricing').waitFor();