[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/pui_settings.spec.ts

@@ -198,7 +198,8 @@ test('Settings - Admin - Barcode History', async ({ browser, request }) => {
   const barcodes = ['ABC1234', 'XYZ5678', 'QRS9012'];
 
   barcodes.forEach(async (barcode) => {
-    await request.post(`${apiUrl}/barcode/`, {
+    const url = new URL('barcode/', apiUrl).toString();
+    await request.post(url, {
       data: {
         barcode: barcode
       },