fix: get first type if array

[jroebu14]

Reasons for making this change

Fixes #3875

Specific schema type arrays break the form.

This happens because logic in SchemaField gets the first element in the type array and if it is e.g. string or number then it will render a field component here rather than an unsupported field component here which is what would happen if the first element was blah. However, further along in the code the getWidget function calls getSchemaType which does not attempt to get the first element in the type array so code execution doesn't fall into any of the conditionals and eventually this error is thrown.

The fix is to copy the logic in SchemaField for array types and ultimately attempt to render a field by selecting the first element in the type array.

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests. I've run npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a description of the PR
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[heath-freenome]

@jroebu14 Can you please update the CHANGELOG.md to put the fix under 5.13.1 in @rjsf/core

[heath-freenome]

@jroebu14 Can you resolve the conflict in the CHANGELOG.md?

[jroebu14]

@jroebu14 Can you resolve the conflict in the CHANGELOG.md?

@heath-freenome no probs. Resolved!