Backport "Make legacy artifact -> packages -> distribtest jobs a noop" to v1.49.x

[apolcyn]

Attempt to build packages successfully on v1.49.x

Currently, the macos artifact build job is failing to install dependencies.

[jtattermusch]

@apolcyn I suspect this might not be what you want. If you provided the link to the failed build, I'd know more.

If you're actually trying to build the artifacts / packages on 1.49.x (rather than just trying to silence an error), this PR is likely not going to help you. I suspect the macos artifact build might be failing because of the recent MacOS monterey migration?

You might want to backport e.g. this instead: #31125

[apolcyn]

@jtattermusch there were Ruby and Python setup failures in the macos artifact build job.

The ruby failure was here: https://fusion2.corp.google.com/invocations/e4fd00c9-d2ae-40e1-915a-36150d86eb44/targets/grpc%2Fcore%2Fmaster%2Fmacos%2Fgrpc_build_artifacts/log. This PR would stop trying to use macos entirely, for the ruby artifact build.

I can't find the link to the Python failure, but it was happening on this command, I believe because it couldn't find python2.7. This PR would stop using that script entirely.

[jtattermusch]

From your log:

++ rvm get stable
Archives path '/Users/kbuilder/.rvm/archives' not writable, aborting.

would be addressed by #31125.

[jtattermusch]

I created #31697.

The python issue would IMHO be addressed by backporting #31126.

A PHP fix is here: #31567 (also backport if that's what you need).

[jtattermusch]

Looks like this was superseded. I'm going to close, feel free to reopen if still needed.