Add filter option to show released and RC xcodes while still hiding betas

[klundberg]

Tell us how we can improve Xcodes I usually don't want to see all xcode versions, sometimes I want to only see the released versions, which the release only filter is useful for. However, I'd love to also have the option to see release candidates in this list, since very often those RCs will just become the released version in time.

Is your feature request related to a problem? Please describe. not a problem, just a convenience i'd like added

What would you like to see? How would you like it to work? Implementation isn't as important, but I could see it either being implemented as a new "Releases and RCs only" filter, this behavior just being defaulted into the "Releases Only" filter, or perhaps as a preference checkbox to "include unreleased RCs in the releases only filter". any of these (or some other solution that i haven't thought of) could work, though changing the behavior of "releases only" might not be agreeable to some folks, so making it an option would likely be the best solution for all.

I'm undecided if it should just show all RCs, or if it should show RCs after the current released version, since I know 14.1 RC1 had some bug that necessitated an RC2 release, so showing RCs newer than the latest release may be the safest thing to do.

[jayrhynas]

I had a related but slightly different request - showing releases + betas that don't have a release. So for example right now it would show mainline Xcode releases as well as the Xcode 15 betas, but once Xcode 15 is released, those betas would hide. I could take a crack at implementing a PR but I'm also not sure the best UI for this combinatorial explosion of filters.

[klundberg]

I like this option better than my proposed rc-only wording actually, and I imagine it'd be simpler to reason about and implement? Perhaps "releases + newest betas" could be the name for a new filter option (which would include RCs as well)