Webhooks: refactor branch/tag building

[stsewd]

• Webhooks can trigger builds to tags, not just branches
• Since webhooks already know the type of the version, we use it to filter by results.
• verbose_name is the value we use to match branches or tags.

Extracted from #11942

[humitos]

I left some questions since I have some doubts, but I think it's getting close.

[ericholscher]

This looks close to me, with just a couple notes. @humitos could also review it again, but I think overall looks good.

Do we plan to build tags directly with this logic? Is there more info on how this changes anything downstream around that?

[stsewd]

Do we plan to build tags directly with this logic?

Only tags/branches that come from a repo webhook

Is there more info on how this changes anything downstream around that?

Not sure what downstream refers to here. But all the logic is the same as before, just more exact when selecting the version that corresponds to the branch/tag to build.

[ericholscher]

Looks good to me -- would still like to have @humitos give a 👍 to merge tho, since he had some other review comments.

[humitos]

Looks good to me! 💯