Changing success message when uploading to gitea to prevent flaky test in Playwright

[ghost]

Description

• Changing success message when uploading to gitea to prevent flaky test in Playwright

Related Issue(s)

• The PR itself

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)

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e13cf0a) 86.42% compared to head (edca48f) 86.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12230      +/-   ##
==========================================
- Coverage   86.42%   86.41%   -0.01%     
==========================================
  Files        1188     1188              
  Lines       18042    18045       +3     
  Branches     2290     2290              
==========================================
+ Hits        15592    15594       +2     
- Misses       2163     2164       +1     
  Partials      287      287              

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