[test] Fully reenable test-api/MultipleIsolatesOnIndividualThreads

Let's see if this is still flaky after almost 5 years.

Bug: v8:4573
Change-Id: I4cd2779b2c4aefc7bb20597db2fccc0e7e7c39c8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2255467Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68465}

test/cctest/cctest.status

@@ -226,9 +226,6 @@
 
 ##############################################################################
 ['system == windows', {
-  # BUG(v8:4573).
-  'test-api/MultipleIsolatesOnIndividualThreads': [PASS, NO_VARIANTS],
-
   # BUG(v8:4642).
   'test-lockers/LockAndUnlockDifferentIsolates': [PASS, NO_VARIANTS],