[infra] Disable failing test

The test test-api/InitializeDefaultIsolateOnSecondaryThread1 has been
failing since at least 6.8, but our infra only recently realized that.

NOTRY=true
NOPRESUBMIT=true
NOTREECHECKS=true

Bug: v8:7856
Change-Id: I8cbfd4ea554bb32c50c01d437efa5b18f60c2fde
Reviewed-on: https://chromium-review.googlesource.com/1104458
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53795}

test/cctest/cctest.status

@@ -116,6 +116,9 @@
   'test-api/SecondaryStubCache': [SKIP],
   'test-api/AccessCheckInIC': [SKIP],
 
+  # BUG(7856)
+  'test-api/InitializeDefaultIsolateOnSecondaryThread1': [SKIP],
+
   # BUG(3742).
   'test-mark-compact/MarkCompactCollector': [PASS, ['arch==arm', NO_VARIANTS]],