[infra] Remove D8 tests from numfuzz builders

Bug: v8:11826
Change-Id: I7f93b4bfeccc47c1a4e6c2b3a72d2595b4af8bfb
Cq-Include-Trybots: luci.v8.try:v8_numfuzz_dbg_ng,v8_numfuzz_ng,v8_numfuzz_tsan_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3197716
Auto-Submit: Almothana Athamneh <almuthanna@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77191}

infra/testing/builders.pyl

@@ -2201,7 +2201,6 @@
       'os': 'Ubuntu-18.04',
     },
     'tests': [
-      {'name': 'd8testing_random_gc'},
       {
         'name': 'numfuzz',
         'suffix': 'marking',