Environment variables passed to logs should be sanitised out of the logs

[krassowski]

Description

In the --debug mode the server logs environment variables which may be sensitive. These should not be included IMO:

jupyter_server/jupyter_server/services/kernels/kernelmanager.py

Line 246 in b85c15b

self.log.debug("Kernel args: %r", kwargs)

Maybe something like self.log.debug("Kernel args: %r", {k: v for k, v in kwargs.items() if k != 'env'}) ?