feat(ui-editor): poc a modal for adding components to form

[nkylstad]

DRAFT, only for comparing.

Description

POC for removing component column in favor of a button in-context of the form. The button opens a modal, where the service owner can select a component type to add, and edit the ID before adding to the form.

Related Issue(s)

• #{issue number}

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

Attention: Patch coverage is 49.41176% with 43 lines in your changes missing coverage. Please review.

Project coverage is 94.97%. Comparing base (016a826) to head (80d9a04).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
...ontainers/DesignView/AddItemModal/AddItemModal.tsx	35.71%	18 Missing ⚠️
...ners/DesignView/AddItemModal/ItemInfo/ItemInfo.tsx	43.75%	9 Missing ⚠️
...ignView/AddItemModal/ItemCategory/ItemCategory.tsx	50.00%	6 Missing ⚠️
...nd/packages/ux-editor/src/utils/formLayoutUtils.ts	25.00%	6 Missing ⚠️
...tainers/DesignView/AddItemModal/AddItemContent.tsx	70.00%	3 Missing ⚠️
...packages/ux-editor/src/containers/FormDesigner.tsx	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13568      +/-   ##
==========================================
- Coverage   95.16%   94.97%   -0.20%     
==========================================
  Files        1464     1470       +6     
  Lines       20163    20246      +83     
  Branches     2439     2448       +9     
==========================================
+ Hits        19189    19229      +40     
- Misses        868      910      +42     
- Partials      106      107       +1     

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