refactor(build_environment): add sdist_root_dir and req to BuildEnvironment

[tiran]

Pull Request Description

What

Replace the generic parent_dir parameter with sdist_root_dir and req so that BuildEnvironment has the context it needs for future sandboxing and environment filtering. All arguments are now keyword-only and follow the common ctx, req, sdist_root_dir order.

Why

Part of the sandboxing proposal.

See: #1019

• PR follows CONTRIBUTING.md guidelines

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📥 Commits

Reviewing files that changed from the base of the PR and between 973c9e4 and 254e2bf.

📒 Files selected for processing (7)

• src/fromager/bootstrapper/_prepare_source.py
• src/fromager/build_environment.py
• src/fromager/commands/step.py
• tests/test_bootstrapper_iterative.py
• tests/test_dependencies.py
• tests/test_packagesettings.py
• tests/test_wheels.py

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[rd4398]

This looks great! I have left a non blocking comment

[rd4398]

This looks good to me! I am moving forward and approving this
cc @LalatenduMohanty @smoparth

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