12716 auto open parent components on drop

[Jondyr]

Description

To make this behaviour feel consistent these are the changes done:

• Mark new nodes as selected when added to the tree view
• Ensure all nodes are expanded/opened when a it or a child tree node is selected

This way, when either a new item is added through drag and drop or by button on the parent element (as described in #12038), the added element should be visible and expanded if applicable.

Related Issues

• Auto-open parent components on drop #12716
• Automatically open tree view item when something is added #12038

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 91.47%. Comparing base (396c405) to head (e828356).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12962   +/-   ##
=======================================
  Coverage   91.46%   91.47%           
=======================================
  Files        1400     1401    +1     
  Lines       19821    19839   +18     
  Branches     2395     2397    +2     
=======================================
+ Hits        18130    18148   +18     
  Misses       1427     1427           
  Partials      264      264           

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[standeren]

Nice! Seems to work excellent in both ux-editor and data modeling! 😎
However, I have some comments that you can consider