[CleanUp] Rename require_network_isolation_key

Bug: 1445752
Change-Id: I710e98a1f4a02f74cb72655ac17b68c33f10855c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4546345


Reviewed-by: Andrew Williams <awillia@chromium.org>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Jincheol Jo <jincheol.jo@navercorp.com>
Cr-Commit-Position: refs/heads/main@{#1147667}