fix: Error when changing Group heading level

[ErlingHauan]

Description

This PR fixes the error when changing headingLevel in a Group component.

• Changed type of property from string to number in Group.schema.v1.json
• Changed the checks in component.ts. If the type is not given for a component propery in the schema, the code will now check the type of the first element of the enum, and either render EditStringValue or EditNumberValue based on the element's type.
• EditNumberValue now accepts an enum value, similar to EditStringValue. If an enum is present, it will render a native select instead of an input field.
• Added more tests to EditNumberValue and EditStringValue.
• Added missing text resources for the groupingIndicator property enum.

Note that this fix will no longer work the next time the JSON schema component script is run, because it will replace "type": "number" with "type": "string". The PR that fixes the script is here. Made this a separate PR so that we can get the fix into prod as soon as possible.

Related Issue(s)

• Changing header size causes error message #13673

Videos

Before

heading-level-before.mp4

After

heading-level-after.mp4

Verification

• 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)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.41%. Comparing base (939464c) to head (5fe11bc).
Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13692   +/-   ##
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  Coverage   94.41%   94.41%           
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  Files        1574     1574           
  Lines       21276    21280    +4     
  Branches     2541     2543    +2     
=======================================
+ Hits        20088    20092    +4     
  Misses        943      943           
  Partials      245      245           

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[mlqn]

Nice work! 💯

[wrt95]

Tested OK in dev 😄