shell: fix deadlock in the bypass function

Previously, the bypass() function was called while the shell mutex
was still held, preventing the use of shell APIs (e.g. shell_print())
inside the bypass context.

This change unlocks the shell mutex before invoking bypass() and
locks it again afterwards, restoring proper shell context handling
and preventing potential deadlocks.

Issue fixed by: roni1234321

Fixes #97722

Signed-off-by: Jakub Rzeszutko <jakub.rzeszutko@verkada.com>