test: check for AbortController existence

Running tests comparitively on older versions of Node.js that
do not have AbortController can be a pain. Only add the
AbortController to knownGlobals if it actually exists.

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/35616


Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>