Add macOS on Intel as fully supported platform

[SeanTAllen]

Bringing it back as we are now running on GitHub Actions.

[SeanTAllen]

First run cycle detector test crashed with bad access during release build. Second time, during debug but same thing.

[SeanTAllen]

@jemc @redvers does either of you have a x86 intel mac with ventura on it? if yes, can you try to verify the cycle-detector runner test failure that is reproducible in CI. So far, I haven't gotten it to happen in Monterey. We never did x86 Ventura on the code base before so this could very well be a real issue.

[redvers]

Unfortunately I'm still on Monterey and, as it's a corporately managed asset I don't have the ability to update it myself.

I'll checkin to see if the upgrade is pending.

[redvers]

Apparently the hardware I have (2015) is below the hardware cutoff Apple chose for Ventura. It will not be possible for me to test against ventura.

[SeanTAllen]

Monterey went boom as well so we don't need Ventura to investigate apparently.