fix(jupyter): Avoid panicking when DEBUG env var is set (denoland#2…

…4168)

Fixes denoland#22050.

It seems very unlikely that a user would be intending to enable deno's
internal debug logs by setting the DEBUG env var. If they really want
that, they can set `RUST_LOG=debug` instead.

cli/tools/jupyter/mod.rs

@@ -7,7 +7,6 @@ use crate::tools::repl;
 use crate::tools::test::create_single_test_event_channel;
 use crate::tools::test::reporters::PrettyTestReporter;
 use crate::tools::test::TestEventWorkerSender;
-use crate::util::logger;
 use crate::CliFactory;
 use deno_core::anyhow::Context;
 use deno_core::error::generic_error;
@@ -52,11 +51,6 @@ pub async fn kernel(
 
   let connection_filepath = jupyter_flags.conn_file.unwrap();
 
-  // This env var might be set by notebook
-  if std::env::var("DEBUG").is_ok() {
-    logger::init(Some(log::Level::Debug));
-  }
-
   let factory = CliFactory::from_flags(flags)?;
   let cli_options = factory.cli_options();
   let main_module =