Add default values for script fields in more-info dialog

[paolapersico1]

Proposed change

Previously, the more-info dialog for script entities didn't show the user-defined default values for the script fields, this PR fixes this.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

alias: TestScript
sequence:
  - if:
      - condition: template
        value_template: "{{ testfield == \"decrement\" }}"
    then:
      - service: counter.decrement
        metadata: {}
        data: {}
        target:
          entity_id: counter.helper
    else:
      - service: counter.increment
        target:
          entity_id:
            - counter.helper
        data: {}
mode: single
fields:
  testfield:
    selector:
      select:
        options:
          - increment
          - decrement
    name: testfield
    default: increment
    required: true
icon: mdi:account

counter:
  helper:
    initial: 0
    step: 1

Additional information

• This PR fixes or closes issue: fixes Script field defaults are not used in frontend #20182
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

Stale

[bramkragten]

I think we should use computeInitialHaFormData here.