Remove delegableOrgSlice

Description

This is a technical dept PR that cleans up several aspects:

Clears out delegableOrgSlice:
- Moves lookupOrg dispatch function to rtkQuery in lookupApi
- Moves chosenDelegableOrgList from state in delegableOrg and place it in apiDelegationSlice (as chosenOrgs)
- Moves choice logic to ChooseOrgPage
- Moves the search to a separate hook
- Deletes delegableOrgSlice
Fixes broken component tests
Fixes github action workflow so running of component tests are triggered by changes in src (as opposed to ignoring changes to src as it appears to have been mistakenly set to)

[ ] 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)
[ ] All tests run green

[ ] User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)