azure-cli: switch to PyPI source

[branchvincent]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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The current GitHub tarball doesn't have a pyproject.toml or setup.py at its root, which means it doesn't work with our brew update-python-resources and upstream has to rely on generating accurate resource blocks themselves.

Instead, this switches to the published sdist on PyPI, which we generally prefer anyway.

[branchvincent]

cc @bebound from the azure side

[bebound]

Thank you. brew update-python-resources looks easier than homebrew-pypi-poet.

Here are some concerns about this new methods:

1. How to deal with pip and setuptools? Can --extra-packages address this?
2. How can we generate and test the formula before it's released to pypi?
3. It seems that the whole resources are generated from setup.py. The version is slightly newer than https://github.com/Azure/azure-cli/blob/dev/src/azure-cli/requirements.py3.Darwin.txt. Generally, it should work. However, issues due to dependency upgrades occur every now and then.

cc @jiasli

[p-linnane]

1. How to deal with pip and setuptools? Can --extra-packages address this?

We can add pip and setuptools as extra packages in pypi_formula_mappings.json.

[p-linnane]

One issue with this method is that pymsalruntime does not have an sdist on PyPI or a repository. It'd be great if that was published because it would make the formula dramatically easier to maintain.

[cho-m]

One issue with this method is that pymsalruntime does not have an sdist on PyPI or a repository.

Although this will cause update-python-resources to fail on macOS, if run on Linux (which I think is the case for both upstream release CI and Homebrew autobump CI), then it will pass as pymsalruntime is not used there.

Some packages are OS-specific so may want to add those as extra resources, e.g. distro on Linux, since we cannot guarantee a user-opened PR was run on Linux.

[p-linnane]

There are a couple other packages that are OS-specific so may want to add those as extra resources, e.g. distro on Linux.

I had a complete formula rewrite done locally with those changes, but the test kept failing with missing modules so I abandoned it.

[github-actions]

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