Add test run/discovery command which can be copied into the terminal

[eleanorjboyd]

Given the logs print Running pytests with arguments: ..., this is useful but includes the exact thing we run instead of what the user could run themselves (it has the specific python script that requires a server connection to work) it would be good for the logs to print a runnable command to help people debug. Something like Equivalent pytest command which can be run from terminal: ....

[eleanorjboyd]

This is delayed for fixing pytest to run based on folder path not just testIds. Need to explore how hard this is from unittest.