I recently enabled --test_verbose_timeout_warnings and that caused a bunch of warnings in our build.
This fixes it, and adds a utility for us or others to make test-wrapping macros that set to short by default.
* fix: relative_file fix when to path is itself relative starting with ../
* feat: Allow users to use ../ in paths and add tests
* fix: Clarify documentation
Co-authored-by: Greg Magolan <gmagolan@gmail.com>