ruff

5de95d70 - Reuse `FormatResult` and `FormatterIterationError` in `format_stdin.rs` (#6985)

Reuse `FormatResult` and `FormatterIterationError` in `format_stdin.rs` (#6985) ## Summary Ensures that we use the same error types and messages. Also renames those struct to `FormatCommand*` for consistency, and removes the `FormatCommandResult::Skipped` variant in favor of skipping in the iterator directly.