[unittest] Temporarily disable ConservativeGCTracesWeakContainer test

Bug: v8:12824
Change-Id: I96adf6c5d930b1476f7f1063ede4fc2344fb5885
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3605242Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80137}

test/unittests/unittests.status

@@ -33,6 +33,11 @@
   'RuntimeCallStatsTest.FunctionLengthGetter': [SKIP],
 }],  # system == macos and arch == arm64 and not simulator_run
 
+# TODO(v8:12824): Enable this test once this is resolved.
+['arch == arm64 and msan', {
+  'WeakContainerTest.ConservativeGCTracesWeakContainer': [SKIP],
+}],  # arch == arm64 and msan
+
 ##############################################################################
 # TODO(v8:7777): Change this once wasm is supported in jitless mode.
 ['not has_webassembly or variant == jitless', {