SAT: display git commit hash after running SAT

[sherifnada]

Tell us about the problem you're trying to solve

Sometimes we want to accept a contributor's PR before necessarily being able to run CI ourselves (e.g: if we are still standing up the sandbox environment). To do this, we ask them to provide evidence of SAT succeeding locally.

Describe the solution you’d like

I want to display the hash of the HEAD commit after running SAT successfully. This should not break if there is no currently available Git commit/running outside of a git repository.

Implementation advice

It seems we can use def pytest_sessionstart() placed in conftest.py in SAT's root directory to display the Git Hash. We can probably also use something else like a contextmanager yield style statement (see SO link at beginning of sentence). IDK if that's the recommended way now in Python.

[sherifnada]

closed in #11497