fix: run npm assets job only with predefined packages

As CI should trigger npm installation only for our known packages with
fixed versions, we can safely assume that missing package-lock.json file
doesn't require direct installation. Libraries should depend on it only
in case, it has some tests to perform, but this would require another
job configuration anyway.

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>