feature: Add ability to toggle worker log output

[myoung34]

• I have configured an environment variable SOME_ENV_VAR with a sensitive value on a worker, and allowed it with WHITELIST_ENVS="SOME_ENV_VAR"
• When the worker starts up, it dumps the environment variables to stdout, which can be (in this case is) sensitive
• Logging software would pick this up and store it with the sensitive value

$ cat logs | grep sensitive\ value | jq .message

"listening for jobs, WORKER_GROUP: default, config: WorkerConfig { worker_tags: 
[\"ansible\", \"bash\", \"bun\", \"csharp\", \"deno\", \"dependency\", \"flow\", \"go\", 
\"hub\", \"other\", \"php\", \"powershell\", \"python3\", \"rust\"], priority_tags_sorted: 
[PriorityTags { priority: 0, tags: [\"ansible\", \"bash\", \"bun\", \"csharp\", \"deno\", 
\"dependency\", \"flow\", \"go\", \"hub\", \"other\", \"php\", \"powershell\", \"python3\", 
\"rust\"] }], dedicated_worker: None, init_bash: None, cache_clear: None, 
additional_python_paths: None, pip_local_dependencies: None, 
env_vars: {\"SOME_ENV_VAR\": \"some sensitive value\"} }"

It would be ideal to be able to toggle this so that it does not dump env_vars.