[test] Do not stress GC in RuntimeCallStatsTest.GarbageCollection

The test performs manual GC with custom GC flags.

Bug: v8:11820
Change-Id: I717411b3c32e468066060e8c4cb8b794a2fe219f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2917035
Auto-Submit: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74750}

test/unittests/unittests.status

@@ -79,6 +79,13 @@
   'DecompressionOptimizerTest.*': [SKIP],
 }],  # not pointer_compression
 
+##############################################################################
+['variant == stress_incremental_marking', {
+  # BUG(v8:11820): the test adjusts GC flags, which does not work
+  # if GC starts before the test.
+  'RuntimeCallStatsTest.GarbageCollection': [SKIP],
+}],  # variant == stress_incremental_marking
+
 ################################################################################
 ['variant == stress_snapshot', {
   '*': [SKIP],  # only relevant for mjsunit tests.