Log output is always `json`

[ecordell]

Regardless of context or flags, the log output seems to always use json - it used to print nicely on the console, so I'm guessing there was some regression here.

Example:

$ thumper run ./scripts/scale-test.yaml --token=<redacted> --endpoint=localhost:50051 --no-verify-ca --log-format=console --log-level=debug --qps=10
{"severity":"info","qps":10,"permission-system":"thumper","time":"2025-02-04T09:43:39-05:00","message":"starting run command"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","name":"scale test","time":"2025-02-04T09:43:39-05:00","message":"loaded script"}
{"severity":"info","probability":0.16666667,"op":"WriteRelationships","time":"2025-02-04T09:43:39-05:00","message":"op probability"}
{"severity":"info","probability":0.8333334,"op":"CheckPermission","time":"2025-02-04T09:43:39-05:00","message":"op probability"}

[tstirrat15]

I wasn't able to reproduce this locally. Was this on your local or somewhere else? I think it's doing some checking for a TTY and making a change based on that.