Fix expression crash when linked ID doesn't exist anymore

[lassopicasso]

Description

Updated how subexpressions handle deleted linked IDs using existing validation logic. Expanded isComponentValueValid to also verify if the selected ID exists in the available options.

Now, when enabling edit mode, instead of making Studio crash due to a selected value that no longer exists in the Combobox options, an error message appears below the Combobox and the invalid selection is automatically cleared.

Additionally, applied red styling to the subexpression border when not in edit mode to visually alert users to any issues with the subexpression.

Before:

https://github.com/Altinn/altinn-studio/assets/74791975/0abab700-7332-4fa8-b6f4-b00a6ef918f7

After:

https://github.com/Altinn/altinn-studio/assets/74791975/3b3b6eb4-06b0-4230-b3fc-048a6521c3ed

Related Issue(s)

• #12564

Verification

• [x] Your code builds clean without any errors or warnings
• [x] Manual testing done (required)
• [x] 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 90.36%. Comparing base (b26b300) to head (91f1b25).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12746   +/-   ##
=======================================
  Coverage   90.36%   90.36%           
=======================================
  Files        1320     1320           
  Lines       18933    18936    +3     
  Branches     2306     2309    +3     
=======================================
+ Hits        17108    17111    +3     
  Misses       1563     1563           
  Partials      262      262           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.