CI: Allow format fix on PRs from forks

[aaronsteers]

This modified the format_fix CI workflow as follows:

• Accept PR number as input, in place of a git ref.
• Operate within forks as well as the main repo.

I also connected to the /format-fix slash command, and added feedback comments to the PR being operated on.

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 24, 2024 5:21pm

[natikgadzhi]

@aaronsteers tell me when you'd like a review on this. Looks sane.

[aaronsteers]

@natikgadzhi - This could be reviewed+merged as-is, but there are two outstanding questions here:

1. Is it okay to connect back to the slash command? (Maybe we wait until next iteration?)
   • We can't test slash command usage until merge, unfortunately, due to hard mapping to master.
2. Is it okay to auto-add add functionality to comment on the PR with the auto-format statuses?

We have code to copy-paste which gives this functionality, but it also makes the PR larger, more surface area to review.

UPDATE: I've toggled to 'ready for review' status, in the context of the above two questions.

FWIW, I've tested successfully on a couple PRs. (It can be run from the manual workflow dispatch - selecting this branch and then entering any PR number.)

[natikgadzhi]

Let's add this to review bucket with @alafanechere for Tuesday. My expectation is that tomorrow we decide between:

• OK to merge as is with slash commands and schedule improvements for 1-2 months in front of us
• We agree to rework to using buttons, AND there is a clear plan to get them to work this week.
• We can synchronously tweak this to use an approach we like, so we merge during the sync ;)

[aaronsteers]

Per meeting today, @alafanechere to review. Hopefully merge today or tomorrow 🚀