[cwctl] add a no-config-update option to the upgrade command (closes #17069607)

[cwconfig] Add "pyramid" config type to MCOMPAT dict I don't know what this is for exactly, but the accept_mode method below queries this dict with the configuration type name. And if the latter is "pyramid", it crashes since there's no key in MCOMPAT dict. So add one with the same value as "all-in-one". This code is called during "upgrade" migration in particular.

[pyramid] Avoid shutting down the repository at exit if it's already shutting down For install `cubicweb-ctl pyramid` command will explicitly call `repo.shutdown()` so the atexit hook is redundant. Prevent the latter to be executed when the repository is already shutting down (otherwise one gets an assertion error).