Pytest report improvement

This is a follow-up of #4 (closed).

After the migration of the test framework to pytest, the report is hard to work with and find relevant information in it (see e.g. https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/jobs/34294).

I would like to see a much shorter report which clearly shows what is failing + details why it failed, like the output from running the python self_test.py, i.e.

• the summary from the terminal output
• log files created in scripts\test\logs