test: move test-inspector-already-activated-cli to parallel

There doesn't seem to be a reason for this test to have to stay in
sequential. It appears to have been placed there out of caution.

PR-URL: https://github.com/nodejs/node/pull/34755


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>