feat: Allow any number of arguments in plus and multiply expressions

[TomasEng]

Important

This pull request is stacked upon #4209, which should be merged first.

Description

This pull request adds support for any number of arguments in the plus and multiply expressions.

Here is the corresponding change in backend: Altinn/app-lib-dotnet#1752

Related Issue(s)

• Make the plus and multiply expressions accept an unlimited number of arguments altinn-studio#18790

Verification/QA

• Manual functionality testing
  • I have tested these changes manually
• Automated tests
  • Unit test(s) have been added/updated
• UU/WCAG (follow these guidelines until we have our own)
  • No testing done/necessary (no DOM/visual changes)
• User documentation @ altinn-studio-docs
  • Has been added/updated: Update docs about the number of arguments in arithmetic functions altinn-studio-docs#2888
• Support in Altinn Studio
  • Issue(s) created for support in Studio: Updating the JSON Schema is also a part of Make the plus and multiply expressions accept an unlimited number of arguments altinn-studio#18790.
• Sprint board
  • The original issue (or this PR itself) has been added to the Team Apps project and to the current sprint board
• Labels
  • I have added a kind/* and backport* label to this PR for proper release notes grouping

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[sonarqubecloud]

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

See analysis details on SonarQube Cloud