deps: replace tracing with log+env_logger, drop console-subscriber

Switch all tracing::{info,warn,error} to log::{info,warn,error}.
Replace tracing_subscriber::fmt::init() with env_logger::init().
Drop tracing, tracing-subscriber, tracing-appender as direct deps.
Drop console feature from jobkit (was pulling in console-subscriber
which pulled in tracing-subscriber).

tracing still compiled as transitive dep of reqwest and tui-markdown,
but our code no longer depends on it.

Co-Authored-By: Kent Overstreet <kent.overstreet@linux.dev>

src/thalamus/supervisor.rs

@@ -11,7 +11,7 @@ use std::collections::BTreeMap;
 use std::fs::File;
 use std::path::PathBuf;
 use std::process::Child;
-use tracing::{info, warn, error};
+use log::{info, warn, error};
 
 fn channels_dir() -> PathBuf {
     dirs::home_dir()