Software Template Array Form Missing Styling

Originally part of #7090

Expected Behavior

The UI should be styled like the other form elements.

Current Behavior

Consider the following software template:

apiVersion: backstage.io/v1beta2
kind: Template
metadata:
  name: add-addon
  title: Addon
  description: Add addon
spec:
  owner: users
  type: website

  parameters:
    - title: Values
      properties:
       should-be-list:
          title: This is a title and is huge
          description: "this is a description you can't see"
          type: array
          items:
            type: string
  steps:
    - id: fetch-repo
      name: Fetch repo
      action: fetch:plain
      input:
        url: 'https://github.com/asummers/backstage/tree/master'

    - id: fetch-template
      name: Fetch Template
      action: fetch:template
      input:
        url: ./template2
        values:
          list: '{{parameters.should-be-list}}'

    - id: publish
      name: Publish
      action: publish:github:pull-request
      input:
        repoUrl: 'github.com?owner=asummers&repo=backstage'
        title: 'feat: Add addon'
        branchName: 'add-addon'
        description: |
          Add addon

  output:
    links:
      - url: '{{steps.publish.output.remoteUrl}}'
        text: 'Go to PR'

Styling wise, we have a few issues with the form that gets created.

Possible Solution

Fix CSS for form.

Steps to Reproduce

See ## Current Behavior

Your Environment

• NodeJS Version (v12): 14
• Operating System and Version (e.g. Ubuntu 14.04): Ubuntu 18.04
• Browser Information: Chrome

[Rugvip]

I’d expect this issue to live somewhere in between our custom MUI theme and the RJSF MUI theme. We use the MUI theme from @rjsf/material-ui over here, and I’d guess that it might not work flawlessly with our other MUI theme overrides over here. If that’s the case then the thing to determine is what the fix is and where it should go

[github-actions[bot]]

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