Migrate Homebrew formula generation from abandoned `homebrew-pypi-poet` to Homebrew's built-in tooling

[DanielMicrosoft]

Current State

The Azure CLI's Homebrew formula generation pipeline uses homebrew-pypi-poet, which:

• Was last updated in 2018 (8 years ago)
• Uses the deprecated pkg_resources API (removed in setuptools 82+)
• Has an open issue from 2023 recommending deprecation
• Forces us to pin setuptools<82 in the Homebrew Docker environment

Why This Matters

1. Technical debt: We're pinning core dependencies to old versions to support abandoned tooling
2. Maintenance burden: Each setuptools upgrade requires checking compatibility
3. Security & stability: Can't take advantage of setuptools improvements and fixes
4. Homebrew evolution: We're not using the officially supported workflow

Temporary Fix (Already Implemented)

Added setuptools<82 to scripts/release/homebrew/docker/requirements.txt to unblock builds. This is isolated to the formula generation container only and doesn't affect Azure CLI itself.

[yonzhan]

Thank you for opening this issue, we will look into it.

[github-actions]

Here are some similar issues that might help you. Please check if they can solve your problem.

• Generate Homebrew Formula based on existing one #11839

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Possible solution (Extracted from existing issue, might be incorrect; please verify carefully)

Generate the new formula based on existing one.

Reference:

• Generate Homebrew Formula based on existing one #11839 (comment)

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