Support clear bot history on new build

[fredagsfys]

As per this issue - impl. support to clear bot history on new builds to prevent PR comment bloat.

[fredagsfys]

I saw your discussion regarding hiding old bot comments, so you really need to preserve build comments? If not - this would support deleting them.

If this doesn't suffice I'll refactor this PR to post a graphql mutation to minimize comments. Let me now...

[markmandel]

I didn't think to just delete the old comments on each run (rather than minimise), but it's not a bad idea to at least test.

I do like being able to see the history over time (so prefer minimisation), it can also make it easier to identify flaky tests, and I have some vague concerns about race conditions when builds are simultaneous, but I don't see any reason not to at least test it out.

I wonder if we'll hit API request limits in the beginning 😄

@XAMPPRocky did you have any thoughts? It was you who brought up removing/hiding the old test results, so wanted to check in first before deploying anything new.

[XAMPPRocky]

It seems fine to me. My one concern about deleting, is that it would make it harder to look at old builds, which sometimes you want to do, but I'm not against deleting either.

[markmandel]

It seems fine to me. My one concern about deleting, is that it would make it harder to look at old builds, which sometimes you want to do, but I'm not against deleting either.

Yeah, same here. But let's try it! If we hate it, we can change it again. I'll get it built and deployed, and will confirm it works on this PR, and assuming it all works, we can roll it out and see how we go!

[markmandel]

Haven't forgotten at this, just been at 100% bandwidth. Do want to get this live so we can take it for a spin, but would like to do it at a time so I can watch in case it goes badly for any reason 😄

[markmandel]

Deploying now! Let's see how we go!

[markmandel]

Looks like it worked! Let's let it bake for a few days (also would love to get that typo fixed), and if it's going swimmingly, let's merge 👍🏻

[quilkin-bot]

Build Succeeded 🥳

Build Id: 40fcfcc0-3b81-4fda-a10c-228ddc427fcb

To build this version:

git fetch git@github.com:googleforgames/quilkin.git pull/390/head:pr_390 && git checkout pr_390
cargo build

[markmandel]

Let's merge it - it's looking good 👍🏻