Summary: load_dev_db.sh was failing. It turns out we try to end the kubectl port-forward process twice, once with a TERM signal and once with a KILL signal. In the event that the TERM signal works, the kill command will fail. This diff makes it so that we only escalate to a kill if the TERM didn't work.

Test Plan: ran the script, it now succeeds

Reviewers: vihang, michelle, philkuz

Reviewed By: michelle

Differential Revision: https://phab.corp.pixielabs.ai/D8459

GitOrigin-RevId: 7106408c5d71ca20c801b1e62a2f1351e7852ec0