Syncing expression tests with app-lib-dotnet

[olemartinorg]

Description

This adds a new test that tests on-group contexts, which was added to useExpressions() in #714, but required a separate implementation in the test bootstrapping to work there.

This PR also changes a few things in the eslint config so that these shared tests are ignored. We don't want to fuss over whitespace changes, and having prettier rule over these tests in both repos that needs to have these tests.

Related Issue(s)

• Fix a few minor bugs in backend dynamics app-lib-dotnet#110

Verification

• Manual testing
  • I have tested these changes manually
  • Creator of the original issue (or service owner) has been contacted for manual testing
  • No testing done/necessary
• Automated tests
  • Unit test(s) have been added
  • Cypress E2E test(s) have been added
  • No automatic tests are needed here
  • I want someone to help me make some tests
• User documentation @ altinn-studio-docs
  • Has been updated
  • No changes/updates needed
• Changes/additions to component properties
  • Changes are reflected in both layout/index.ts and layout.schema.v1.json, and these are all backwards-compatible
  • No changes made
• Support in Altinn Studio
  • Issue(s) created for support in Studio
  • This change/feature does not require any changes to Altinn Studio
• Sprint board
  • The original issue (or this PR itself) has been added to the Team Apps project and to the current sprint board

[sonarqubecloud]

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