Implemented runnables for specially for running tests for Go.

I'm grateful for your feedback because this is my first experience with
Rust and Zed codebase.
![resim](https://github.com/zed-industries/zed/assets/1047345/789b31da-554f-47cd-a08c-444eced104f4)

https://github.com/zed-industries/zed/assets/1047345/ae1abd9e-3657-4322-9c28-02d0752b5ccd


Release Notes:

- Added Runnables/Tasks for:
  - Run test functions which start with "Test"
  - Run subtests
  - Run benchmark tests
  - Run main function



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Co-authored-by: Thorsten Ball <mrnugget@gmail.com>
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>