Docs: Set use_login_shell=False for localhost in performance benc…

…hmark (#5847)

As noted previously, using a login shell can impact performance.
Let's disable the login shell for the performance benchmark script.

docs/source/howto/include/scripts/performance_benchmark_base.py

@@ -51,7 +51,7 @@ def main(code, number, daemon):
             scheduler_type='core.direct',
             workdir=tempfile.gettempdir(),
         ).store()
-        computer.configure(safe_interval=0.0)
+        computer.configure(safe_interval=0.0, use_login_shell=False)
         echo.echo_success(f'Created and configured temporary `Computer` {label} for localhost.')
         computer_created = True