feat(releases): allow resolving in an upcoming release in the ui

[scefali]

Now that the backend for resolving in an upcoming release is now ungated as of this PR, we can do the same in the UI. This feature is relatively low risk to just roll out to everyone because not many people will use it an it's well validated at Sentry (it was enabled while I was still a full time empoyee, lol).

I'm also going to update the docs for this new feature.