Deduplicate blueprint editor code

[karwosts]

Proposed change

The blueprint editor for script and automation are 90% the same, but the code is duplicated, requiring making edits to both files for any change. Deduplicate with inheritance. No functional change.

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:
• 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

[bramkragten]

I guess this could have been a separate element taking config and blueprints as a parameter?

[karwosts]

Hm, yeah I can see that might have been a good alternative, I hadn't considered it.

I'd probably rather not spend the time to go reimplement this again though, unless you truly don't like this approach.

[bramkragten]

I don't really like base classes as it can be confusing what happens where... I'm ok for it now though :-)