Fix a bug where an unexpected newline is inserted when formatting fun () -> ?assertMatch(..., ...) end..

[sile]

Copilot Summary

This pull request includes changes to the efmt_core module to improve the formatting logic and enhance the test coverage. The most important changes include modifying the Formatter implementation to handle single-line mode and skipping logic more effectively, and updating the test cases to include additional scenarios for macro formatting.

Improvements to formatting logic:

• efmt_core/src/format.rs: Adjusted the Formatter implementation to correctly handle single-line mode and skipping logic, ensuring that pending_blank is managed appropriately.

Enhancements to test coverage:

• efmt_core/src/items/macros.rs: Updated the assert_match test to include multiple scenarios, improving the robustness of macro formatting tests.