separate namespace for new models

[mirkoSekulic]

Description

Separate namepace for new models introduced.
If datamodel reference exists in application metadata, namespace stays unchanged.

Related Issue(s)

• Ensure model name is used in namespace for model as suggested above #11732

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 86.73%. Comparing base (f90ec1b) to head (c577a99).
Report is 1 commits behind head on main.

❗ Current head c577a99 differs from pull request most recent head 6b82fa9. Consider uploading reports for the commit 6b82fa9 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12402   +/-   ##
=======================================
  Coverage   86.73%   86.73%           
=======================================
  Files        1205     1205           
  Lines       18109    18109           
  Branches     2292     2292           
=======================================
+ Hits        15706    15707    +1     
+ Misses       2122     2121    -1     
  Partials      281      281           

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[standeren]

Cool ⭐