Button to copy service response as json for templates

[karwosts]

Proposed change

Button to format service action response as json, for use with the template editor. Discussed a bit before at #18866.

Copies:

{% set action_response = {"calendar.calendar_1":{"events":[{"start":"2024-06-26T09:40:36.093296-07:00","end":"2024-06-26T10:40:36.093296-07:00","summary":"Future Event","description":"Future Description","location":"Future Location"}]},"calendar.calendar_2":{"events":[{"start":"2024-06-26T08:40:36.093461-07:00","end":"2024-06-26T09:40:36.093461-07:00","summary":"Current Event"}]}} %}

and can be directly pasted in the template editor.

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/developer-tools-use-variables-generated-in-service-to-be-used-in-template/652213
  https://community.home-assistant.io/t/calendar-get-events-response-variable-in-developer-tools-template/731643
  https://community.home-assistant.io/t/response-variable/589035/7

• 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

Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Added a slot element named "extra-actions" to the YAML editor component, allowing for additional UI actions to be conditionally rendered.
  • Enhanced developer tools panel with a button to copy templates to the clipboard and display a toast notification upon success.

• Localization

  • Introduced a new translation key for "Copy to clipboard (template)" to improve user interface support.

[bramkragten]

This one should be outside of the copyClipboard ternary, it is not possible to add extra actions now without adding the copy clipboard action.

[karwosts]

Changed, is another property the best way to solve? I don't want to create the card-actions div if there aren't any actions.

[bramkragten]

Yeah looks good! 👍