Update pytest command to capture results to file

[dbarbuzzi]

This PR updates the recently added run_tests.sh script to include flags in the pytest command so test results will be captured. It also fixes the improper use of -s as well as makes variable usage consistently safer by wrapping in quotes to prevent unexpected globbing/etc. (now fully passes shellcheck).

[github-actions]

👋 Hi! Thank you for contributing to llm-compressor. Please add the ready label when the PR is ready for review.

[dsikka]

Will this output all the info logs?

[dbarbuzzi]

Will this output all the info logs?

Yes, the tee-sys value for --capture allows pytest to capture all of the output while also mirroring it live to console. If you want live output, this is the value that should be used instead of -s in things like CI/CD.