resourceam: do not allow resource identifier to start with 'app_'

[mgunnerud]

Description

• The "app_" prefix is reserved for apps. Show an error message if user attempts to create a resource with the "app_" prefix. This is validated in frontend and in BFF
• Only allow a-å, 0-9, - and _ as valid characters in resource identifier. In frontend, any illegal characters are replaced by "-". In backend, creating or importing a resource with illegal characters in identifier will return error 400.

Related Issue(s)

• Resourceadm: Possible to create an Resource with app_ prefix #12490

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 ✅

Project coverage is 88.18%. Comparing base (6906404) to head (c54c9c9).
Report is 3 commits behind head on main.

❗ Current head c54c9c9 differs from pull request most recent head 35e30f9. Consider uploading reports for the commit 35e30f9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12500      +/-   ##
==========================================
+ Coverage   88.16%   88.18%   +0.01%     
==========================================
  Files        1287     1287              
  Lines       18367    18384      +17     
  Branches     2256     2257       +1     
==========================================
+ Hits        16194    16212      +18     
+ Misses       1905     1904       -1     
  Partials      268      268              

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[mgunnerud]

Converted to draft: need to add validation to backend as well