Feat: Add in ability to delete a single output by prompt name in editor

[justinkchen]

https://github.com/lastmile-ai/aiconfig/issues/1451

Adds the ability to delete a single output in the config editor

[rossdanlm]

Btw for failing blockers (on autoformatting), you can use either of these commands to reformat and get unblocked (I think, not 100% sure):

1. black --exclude '/\.sl\b' . --line-length=79
2. fd --glob '*.py' python/src/aiconfig/editor | xargs python -m 'scripts.lint' --mode=fix --files

[rholinshead]

Ah, looks like the formatting lint is still failing. I'll override to merge to unblock and then I can do a quick PR with the formatting. I'd recommend setting up black formatter extension in vs code (if you use it) so that it formats automatically on save instead of needing the command