bundle: add WinGet support

[MikeMcQuaid]

• make Windows package state manageable from WSL
• use winget and msstore sources with stable IDs
• keep installer UI disabled while allowing UAC retry
• dump non-internal packages with readable names

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[Copilot]

Pull request overview

This PR adds brew bundle support for managing Windows packages via WinGet when running under WSL, including dumping installed WinGet packages into a Brewfile and installing/cleaning them up in a non-interactive way (with an elevation retry flow).

Changes:

• Introduces a new Bundle extension (winget) that can detect, dump, install, and clean up WinGet packages (WSL-only).
• Updates platform-specific skipping behavior so winget entries are skipped (with warnings) on macOS and on non-WSL Linux.
• Adds comprehensive RSpec coverage for the new extension and updates docs/examples to include winget usage.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Library/Homebrew/test/support/helper/subcommand.rb	Adds winget?/no_winget? predicates to the test subcommand args helper.
Library/Homebrew/test/bundle/winget_spec.rb	New spec suite covering WinGet check/dump/install/cleanup and path handling.
Library/Homebrew/test/bundle/skipper_spec.rb	Adds skipper coverage for winget across macOS/Linux/WSL.
Library/Homebrew/test/bundle/dumper_spec.rb	Ensures dump ordering and selection includes the new winget extension.
Library/Homebrew/test/bundle/dsl_spec.rb	Verifies Brewfile DSL parsing and option validation for winget.
Library/Homebrew/extend/os/mac/bundle/skipper.rb	Skips winget entries on macOS with a WSL requirement warning.
Library/Homebrew/extend/os/linux/bundle/skipper.rb	Skips winget entries on Linux when not running under WSL.
Library/Homebrew/bundle/skipper.rb	Adds :winget to the env-based skip list.
Library/Homebrew/bundle/extensions/winget.rb	Implements the new WinGet Bundle extension (dump/install/cleanup, WSL path helpers, elevation retry).
Library/Homebrew/bundle/extensions.rb	Adds winget to the legacy dump ordering list (at the end).
docs/Brew-Bundle-and-Brewfile.md	Documents WinGet support and provides Brewfile examples.

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[p-linnane]

Love to see bundle continue to become more versatile!