[CI:BUILD] Minor: Rename the OSX Cross task

[cevich]

For many months this task has not been cross-compiling, it's building natively on a Mac. Avoid any possible confusion by renaming the task.

Does this PR introduce a user-facing change?

None

[rhatdan]

LGTM

[cevich]

Re-drafting: There's a bug in the artifacts task.

[cevich]

Fixed, now the artifacts task is working with the updated OSX task name.

[cevich]

Force-push: Renamed to "Build for MacOS amd64+arm64"

[packit-as-a-service]

Ephemeral COPR build failed. @containers/packit-build please check.

[Luap99]

/lgtm

[openshift-ci]

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[Luap99]

I was about to comment yesterday that the implicit name -> URL dependency sucks as this is totally non obvious but didn't spend time actually checking for other places. Turns out it is used in more than one place...
https://cirrus-ci.com/task/6562960993157120. This PR really should have not used CI:BUILD.

I already pushed a commit to fix it in my machine PR: da2cbb0

[cevich]

implicit name -> URL dependency

Oof, yeah, this is really horrible. Sorry for assuming that the "artifacts" task was the only place 😞

The only way I can think to "fix" this, is to add a comment on every relevant name: line warning humans to go searching for the URL-encoded lines. I'm not very happy about needing to do that though, so if you can think of a better solution (starlark?), PLMK.