Allow mixed env keys in script wrappers

[MikeMcQuaid]

• Match env_script_all_files with write_env_script
• Avoid Sorbet failures when formulae extend environment hashes

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[Copilot]

Pull request overview

Aligns Pathname#env_script_all_files’s Sorbet type signature with Pathname#write_env_script so callers can pass environment hashes that contain a mix of Symbol and String keys (a pattern used when environment hashes are extended/merged), and adds a spec to cover that behavior.

Changes:

• Broaden env_script_all_files’s env key type to T.any(String, Symbol) to match write_env_script.
• Update the env_script_all_files spec to exercise mixed key types (Symbol + String) and verify wrapper output.

Reviewed changes

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

File	Description
Library/Homebrew/extend/pathname.rb	Updates Sorbet signature for env_script_all_files to accept mixed String/Symbol env keys, matching write_env_script.
Library/Homebrew/test/extend/pathname_spec.rb	Adjusts/renames the spec to assert mixed env key types work end-to-end and generate the expected wrapper scripts.

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