Enable more cask metadata migration to JSON for all users

[MikeMcQuaid]

• Remove the developer gate after proving the update-time path.
• Keep the regression pinned to a non-developer update run.

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[Copilot]

Pull request overview

This PR expands the existing brew update “update-report” migration logic so it converts supported installed Cask metadata (legacy Ruby caskfiles and *.internal.json) into installed *.json metadata for all users, not just developers. This aligns the migration behavior with the intended broader rollout while keeping the regression coverage anchored to a non-developer update run.

Changes:

• Remove the Homebrew::EnvConfig.developer? gate from migrate_caskroom_caskfiles_to_json, enabling migration for all users.
• Update the existing spec to assert migration occurs when developer? is false and adjust the example description accordingly.

Reviewed changes

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

File	Description
Library/Homebrew/cmd/update-report.rb	Enables cask metadata migration during update-report runs for all users by removing the developer-only guard.
Library/Homebrew/test/cmd/update-report_spec.rb	Updates regression coverage to validate the migration in a non-developer environment.

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[github-actions]

Automated approval by github-actions[bot] for #22958 because all requirements are met:

• #22958 is not from a fork.
• #22958 is not a draft.
• The approval workflow is running on a weekday.
• @MikeMcQuaid is listed as a lead maintainer in README.md.
• @MikeMcQuaid approved Homebrew/brew PR #23038 in the last 7 days.
• #22958 was created at least 48 hours ago and has had no human review since creation.
• Copilot has already reviewed #22958.
• #22958 does not modify .github/ or other sensitive files.
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