Improve cleanup ask output

[MikeMcQuaid]

• Avoid noisy command previews during brew upgrade --ask.
• Share one dry-run cleanup heading across formulae.
• Get upgrade cleanup output from one named dry run.
• Reuse bundle cleanup output formatting for consistency.
• Avoid shelling out for bundle cleanup dry runs.
• Reuse Cleanup#cleanup_formula so dry runs show removals.
• Skip empty cleanup headings when there is no work.

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[Copilot]

Pull request overview

This PR refines how cleanup “dry-run” output is produced and displayed during upgrade planning (brew upgrade --ask) and brew bundle cleanup, aiming to reduce noisy/duplicated headings and make formatting consistent by reusing cleanup logic in-process.

Changes:

• Adjust Homebrew::Upgrade.upgrade_formulae to avoid per-formula install-cleanup previews during dry runs and instead print a single aggregated dry-run cleanup section.
• Add Homebrew::Cleanup.dry_run_output and printed_dry_run_output? helpers to capture and print dry-run cleanup output consistently.
• Update brew bundle cleanup to reuse Cleanup dry-run output formatting (and avoid shelling out for dry-run cleanup), with corresponding spec updates.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Library/Homebrew/upgrade.rb	Prints one aggregated dry-run cleanup section after a dry-run upgrade pass.
Library/Homebrew/cleanup.rb	Adds helpers to capture cleanup dry-run output and print standardized headings.
Library/Homebrew/bundle/subcommand/cleanup.rb	Uses Cleanup helpers for dry-run cleanup output instead of shelling out.
Library/Homebrew/test/cmd/upgrade_spec.rb	Adds coverage ensuring dry-run cleanup output is sourced from a single named run.
Library/Homebrew/test/cmd/bundle/cleanup_subcommand_spec.rb	Updates expectations to reflect in-process cleanup dry-run output formatting.

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