Resourceadm: allow publishing resources and editing access lists in AT21 and AT24

[mgunnerud]

Description

• Add AT21 and AT24 to list of available environments for publish resource and edit access lists
• Use helper function to display environments in import service from Altinn 2 modal, to hide AT environments from users outside ttd organization.

Related Issue(s)

• #12772

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.19%. Comparing base (da69059) to head (d673225). Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12781   +/-   ##
=======================================
  Coverage   90.19%   90.19%           
=======================================
  Files        1308     1308           
  Lines       18760    18760           
  Branches     2281     2281           
=======================================
  Hits        16921    16921           
  Misses       1579     1579           
  Partials      260      260           

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