Show descriptions in script editor

[karwosts]

Proposed change

Render the description field for scripts in the editor in the same way that we do for automations.

This would likely benefit from further work to add the description field editor to the UI (in the rename dialog like the automation editor), but for now we can at least show the description for users which have configured it in YAML.

I am also working on moving the script editor to be more like the automation editor as well, in a separate PR.

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

Additional information

• This PR fixes or closes issue: fixes #

• This PR is related to issue or discussion:
  https://community.home-assistant.io/t/add-description-field-in-ui-script-editor/726084
  Add description field to scripts #16259

• 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

[karwosts]

Updated for blueprint editors as well.

Changed blueprint-automation-editor from <p> description to <ha-markdown> to match the style of the manual-automation-editor.

[piitaya]

Thank you @karwosts. I was planning to unify the script editor with the automation editor but if you will open a PR I'm fine with that too! I'll review it.