Resourceadm: improve validation

[mgunnerud]

Description

• Resource identifier must be at least 4 characters
• Trim Resource title, description and rightsDescription before saving
• Validate that Resource title, description and rightsDescription are not empty strings or whitespace in backend
• When a resource is of type "Maskinporten skjema", at least one of the references in resourceReference must have referenceType == "MaskinportenScope" validation frontend and backend
• Save resource reference select fields on change, not on blur
• Save resource version field on change, not on blur
• UU improvement for edit button label
• Fix button sizing so buttons in horizontal button row have consistent sizing

Related Issue(s)

• Resourceadm: improve validation #12678

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 90.19%. Comparing base (3387181) to head (c7f69a6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12683   +/-   ##
=======================================
  Coverage   90.18%   90.19%           
=======================================
  Files        1299     1299           
  Lines       18573    18588   +15     
  Branches     2261     2261           
=======================================
+ Hits        16750    16765   +15     
  Misses       1564     1564           
  Partials      259      259           

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[ghost]

Looks good! 😄
A few comments added