test: skip tests consistently in parallel.status

Some tests are marked SKIP,FLAKY (resulting in yellow/unstable CI when
they fail) and others are marked SKIP (which means the results don't
affect CI at all). There doesn't seem to be any reason for the
difference. Mark them all as SKIP as IBM i for consistency and to have
the luxury of a green daily CI. We'll want these to be at least
SKIP,FLAKY (and preferably not skipped at all) before IBM i is
supported.

PR-URL: https://github.com/nodejs/node/pull/37035


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>