Harden cask uninstall path checks

[MikeMcQuaid]

• stop each_resolved_path from accepting . or .. segments that can escape intended delete targets
• re-check glob matches after expansion so undeletable paths are filtered before rm -rf runs
• add regressions in abstract_uninstall_spec.rb so traversal and glob bypasses stay covered

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[Copilot]

Pull request overview

This PR hardens Homebrew Cask uninstall/zap deletion path handling to reduce path traversal and unsafe deletions, and adds regression tests to keep these protections in place.

Changes:

• Tighten each_resolved_path validation to reject paths containing ./.. segments.
• Filter out undeletable paths after glob expansion (instead of checking only the pre-glob path).
• Add RSpec coverage for traversal rejection and post-glob undeletable filtering for both uninstall and zap.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
Library/Homebrew/cask/artifact/abstract_uninstall.rb	Strengthens each_resolved_path path validation and filters undeletable glob results before deletion.
Library/Homebrew/test/cask/artifact/abstract_uninstall_spec.rb	Adds regression tests for traversal-segment rejection and undeletable glob-match filtering for uninstall/zap.

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