Audit cask flight step conversions

[MikeMcQuaid]

Blocked until next release.

• Keep tap-wide conversion checks separate from the cask DSL change.
• Encourage *_steps only when legacy *flight blocks are simple.
• Match literal file-preparation calls that the step runner can model.

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[Copilot]

Pull request overview

This PR enhances the RuboCop::Cop::Cask::InstallSteps cop to automatically convert “simple” legacy flight blocks (e.g., postflight do ... end) into the declarative *_steps DSL when the block consists solely of file-preparation operations that the steps runner can model.

Changes:

• Enable autocorrection for simple flight blocks by adding an audit_flight_block path when a matching *_steps stanza is not already present.
• Implement an autocorrect that rewrites eligible flight blocks into the corresponding *_steps block using the shared install-step conversion helper.
• Update/add RuboCop spec coverage to assert both the offense and the expected corrected source, and ensure non-file-prep flight blocks are not autocorrected.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Library/Homebrew/rubocops/cask/install_steps.rb	Adds AutoCorrector support and converts simple pre/post/uninstall_*flight blocks into *_steps via shared conversion helpers.
Library/Homebrew/test/rubocops/cask/install_steps_spec.rb	Updates the spec to expect an offense + autocorrection for simple file-prep postflight blocks and keeps a negative case for non-file-prep blocks.

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