[Dev] Remove implicit workflow transitions

[pitrou]

Describe the enhancement requested

Currently, some workflow transitions (using labels such as "awaiting review") are implicitly triggered on various events, such as posting a comment on a PR. This is both useless and confusing, because it does not mirror the actual state of a PR (you can post a comment without it being a review, for example).

We should disable those implicit transitions. Later we can implement explicit transitions, using dedicated user actions.

Component(s)

Developer Tools

[pitrou]

Thoughts @jorisvandenbossche @felipecrv @kou @js8544 ?

[js8544]

PR labels are indeed very confusing sometimes. But I'm not sure what would explicit transitions look like? Could you give an example?

[pitrou]

It looks like this, though it seems this bot is actually slightly broken:
python/cpython#115989 (comment)

[kou]

I'm not using these labels. (I just ignore these labels.) So I don't have a strong opinion for this.
I'm using "new comment" email notifications as review/answer triggers.

[felipecrv]

I never look at and never use the labels. My workflow is opening the "Participating" and "Mentioned" filters, and scanning from top to bottom for items with recent updates.