Order reinstall package phases

[MikeMcQuaid]

• prefetch formula and cask reinstall downloads together
• continue serial reinstalls after individual failures
• batch cleanup for successfully reinstalled packages

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[Copilot]

Pull request overview

This PR restructures brew reinstall to better sequence download/prefetch, reinstall execution, and post-run cleanup across formulae and casks, aiming to (1) prefetch downloads together, (2) keep going after individual failures, and (3) batch cleanup for successfully reinstalled packages.

Changes:

• Enqueue and prefetch formulae (including dependent formula installers) and casks into a shared DownloadQueue, then proceed with reinstalls that successfully downloaded.
• Track successfully reinstalled formulae/casks and perform a single Cleanup.install_clean! at the end of the run.
• Extend Cask::Reinstall.reinstall_casks to optionally accept prebuilt installers and return the list of successfully reinstalled casks; update/add specs to validate ordering and cleanup behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
Library/Homebrew/cmd/reinstall.rb	Reorders reinstall phases: shared prefetch, serial reinstall after failures, and end-of-run batch cleanup.
Library/Homebrew/cask/reinstall.rb	Adds support for passing cask installers and returning the successfully reinstalled casks.
Library/Homebrew/test/cmd/reinstall_spec.rb	Adds/updates command-level specs to validate phase ordering and cleanup timing.
Library/Homebrew/test/cask/reinstall_spec.rb	Updates cask reinstall specs for new prefetch messaging and installer behavior.

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