Performance fixes that improved ra0692-01

[olemartinorg]

Description

A few minor fixes to make the upcoming ssb/ra0692-01 more tolerable. This form has very many components, possibly with dynamic behaviour, and simply setting data in the NodesContext is noticably slow (presumably because all selectors have to re-run).

1. Removed an undefined class in src/features/alertOnChange/DeleteWarningPopover.tsx
2. Making useLookupBinding() static. This didn't really need to re-render when DataModelsProvider changes(?). I didn't really look into the root cause for this, but I observed that <DataModelValidation /> re-rendered for all nodes when clicking a checkbox (which in turn added a row to a repeating group).
3. When multiple new components were discovered in the node generator, these would all call the restart() function. This only caused {} to be set in the NodesContext. This seems harmless, but it turns out setting an empty object still means all selects have to re-run, so this contributed to a very noticable slowdown when adding a row to a repeating group (which adds multiple new components).

Sadly, this form is far from optimal after these fixes, but they're low-hanging fruit.

Related Issue(s)

• https://altinn.slack.com/archives/C02EJ9HKQA3/p1731942708031739?thread_ts=1727953847.323699&cid=C02EJ9HKQA3

Verification/QA

• Manual functionality testing
  • [x] I have tested these changes manually
  • [ ] Creator of the original issue (or service owner) has been contacted for manual testing (or will be contacted when released in alpha)
  • [ ] No testing done/necessary
• Automated tests
  • [ ] Unit test(s) have been added/updated
  • [ ] Cypress E2E test(s) have been added/updated
  • [x] No automatic tests are needed here (no functional changes/additions)
  • [ ] I want someone to help me make some tests
• UU/WCAG (follow these guidelines until we have our own)
  • [ ] I have tested with a screen reader/keyboard navigation/automated wcag validator
  • [x] No testing done/necessary (no DOM/visual changes)
  • [ ] I want someone to help me perform accessibility testing
• User documentation @ altinn-studio-docs
  • [ ] Has been added/updated
  • [x] No functionality has been changed/added, so no documentation is needed
  • [ ] I will do that later/have created an issue
• Support in Altinn Studio
  • [ ] Issue(s) created for support in Studio
  • [x] This change/feature does not require any changes to Altinn Studio
• Sprint board
  • [x] The original issue (or this PR itself) has been added to the Team Apps project and to the current sprint board
  • [ ] I don't have permissions to do that, please help me out
• Labels
  • [x] I have added a kind/* label to this PR for proper release notes grouping
  • [ ] I don't have permissions to add labels, please help me out

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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