Fix DescriptionField customization

[alex-pex]

Reasons for making this change

Using a description with a FixedArray and a custom theme (mui, boostrap, ...) crashes.
This fix the problem at the source. That's why it replaces #2451

Fixes #2481, #2363, #2219

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 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

[alex-pex]

You can reproduce the bug with this schema

{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "features": {
      "$ref": "#/definitions/features__core_workspace_calendar"
    }
  },
  "definitions": {
    "features__core_workspace_calendar": {
      "title": "Espace de travail : Calendrier [CWC-514]",
      "description": "Gestion des horaires journaliers",
      "type": "array",
      "items": [
        {
          "type": "boolean",
          "default": false
        }
      ]
    }
  }
}

and switching to bootstrap4 theme

[ssbyoung]

@newt10 can you take a look at this PR?

[alex-pex]

Hi! I updated the PR, can someone do a review? I'm using a patched version for the moment

[alex-pex]

@epicfaace do I need to do something else? for me the PR is ready for review (I updated the tests as asked)

[heath-freenome]

Fixed in the v5 beta, see the 5.x migration guide