Add devtest to azpysdk

[JennyPng]

#42601

[Copilot]

Pull request overview

This PR adds a new devtest command to the azpysdk tool that tests packages against dev build versions of their Azure SDK dependencies from a DevOps feed. The implementation follows the established patterns in the codebase for Check subclasses, with the _build_pytest_args method refactored into the base Check class to be shared between whl and devtest.

Key Changes

• Adds new devtest check that uninstalls GA versions of Azure SDK dependencies and reinstalls dev builds from an Azure DevOps feed before running tests
• Refactors _build_pytest_args from whl.py into the Check base class for code reuse
• Adds uninstall_from_venv helper function to support package uninstallation in virtual environments

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
eng/tools/azure-sdk-tools/azpysdk/devtest.py	New check implementation with helper functions for discovering, uninstalling, and reinstalling Azure SDK packages with dev builds
eng/tools/azure-sdk-tools/azpysdk/Check.py	Adds _build_pytest_args method to base class for shared pytest argument building logic
eng/tools/azure-sdk-tools/ci_tools/functions.py	Adds uninstall_from_venv function to support uninstalling packages from virtual environments
eng/tools/azure-sdk-tools/azpysdk/whl.py	Removes _build_pytest_args method (moved to base class)
eng/tools/azure-sdk-tools/azpysdk/main.py	Registers the new devtest command
doc/tool_usage_guide.md	Documents the new devtest command

[Copilot]

The install_dev_reqs call should be wrapped in a try-except block to handle potential failures gracefully, similar to how it's done in whl.py (lines 68-73). If dependency installation fails for one package, the check should log the error, add a failure code to results, continue to the next package, and not abort the entire run.

Example:

try:
    self.install_dev_reqs(executable, args, package_dir)
except Exception as exc:
    logger.error(f"Failed to install dev requirements for {package_name}: {exc}")
    results.append(1)
    continue