Run all or specific tests on save

[RemyNtshaykolo]

Add a 'run on save' feature like the picture bellow so that I can write my test code and then develop my say_hello method and testing it easily just by saving my file.
It will be nice to :

• be able to activate run on save for multiple test or even for a whole file.
• be able to add a shortcut to quickly activate/deactivate this auto save feature for a given unit test using the cursor
• be able to add a shortcut to quickly activate/deactivate this auto save feature for a file of unit tests using the active file in the editor

[brettcannon]

Moved to #17185