Feat/1825 hide columns grid

[paal2707]

Description

Added support for configuring columns in GridComponent, and specifically the ability to hide columns based on expressions.
Added layout validation for duplicate configuration at both 'cell level' and 'column level', and for correct number of cells in all rows relative to number of columns.

Missing

• Tests (e2e and possibly unit) on functionality
• Fix errors reported in comments on this assignment:
  Repeating groups/Grid: Muligheten til å skjule kolonner i en gruppe/grid #1825 (comment) (should be fixed in Fixes for hidden columns in RepeatingGroup #3911)

Related Issue(s)

• closes Repeating groups/Grid: Muligheten til å skjule kolonner i en gruppe/grid #1825

Verification/QA

• Manual functionality testing
  • 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
  • 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
  • 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
  • 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
  • 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
  • I don't have permissions to do that, please help me out
• Labels
  • I have added a kind/* and backport* label to this PR for proper release notes grouping
  • I don't have permissions to add labels, please help me out

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/1825-hide-columns-grid

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