DOC add setup instructions for MacOS and support macos-latest in CI

[Tiger-Du]

Describe the issue linked to the documentation

Hello! While running the tests for PyRIT locally with make test-cov-xml, I came across a few errors that resulted from aria2, pyodbc, and unixODBC not being installed locally. These errors do not appear in Actions since the ubuntu-latest image has these packages installed by default from what I believe (https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md).

Suggest a potential alternative/fix

Perhaps we should add a note somewhere in the doc/contributing folder that Ubuntu is the intended environment for testing at the moment and that aria2, pyodbc, and unixODBC should be installed. I'd be happy to do so but would love to hear what everyone thinks first!

[romanlutz]

Are you using MacOS? Most of us use Windows and Ubuntu is used in the pipelines so they tend to work best.

We should probably try and set up macOS pipelines at some point.

Feel free to add extra info for macOS if I am indeed making correct assumptions.

[Tiger-Du]

Yep, I am indeed using macOS. And okay, great, I'll go ahead and open a PR to add some more information.

As far as setting up macOS pipelines, I think that it would require changing os: [ubuntu-latest] in L25 of .github/workflows/build_and_test.yml to os: [ubuntu-latest, macos-latest]. However, the runs take around 10 minutes at the moment, and adding macOS would double the time, which might be inconvenient.

[romanlutz]

They run in parallel, shouldn't be a problem. The setup usually doesn't "just work", though. So there may be some work in getting the setup working on the build agent. You can give it a try if you like!

[romanlutz]

To recap what needs to happen:

• documented instructions for setup on MacOS since there are extra steps. This may involve some trial and error to arrive at a working solution.
• add those steps in .github\workflows\build_and_test.yml and support macos-latest in addition to ubuntu-latest