Removing parallell for Playwright tests

[ghost]

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[framitdavid]

This should decrease the Gitea pressure! 👏

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f73ce31) 86.42% compared to head (ebbae9e) 86.41%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12257      +/-   ##
==========================================
- Coverage   86.42%   86.41%   -0.01%     
==========================================
  Files        1188     1188              
  Lines       18049    18049              
  Branches     2292     2292              
==========================================
- Hits        15598    15597       -1     
- Misses       2163     2164       +1     
  Partials      288      288              

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