gpui_macros: Hide inner test function from project symbols (#38809)

This makes rust-analyzer not consider the function for project symbols,
meaning searching for tests wont show two entries.

Release Notes:

- N/A *or* Added/Fixed/Improved ...
8ebe4fa149Lukas Wirth committed on 9/24/2025, 6:07:34 PM· committed by GitHubparent6b646e3
1 file changedLine totals unavailable