[rab/gsab] Disable a test in stress-snapshot mode

It's hitting unimplemented code paths.

Bug: v8:11111, v8:12731
Change-Id: Icbffced6cbe207426363daa5f3b9ff5677b58b6c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3548816Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79605}

test/mjsunit/mjsunit.status

@@ -1468,6 +1468,9 @@
   # Script referenced only through context-dependent SourceTextModule
   # https://bugs.chromium.org/p/v8/issues/detail?id=11073
   'tools/processor': [SKIP],
+  # TODO(v8:11111) and
+  # https://bugs.chromium.org/p/v8/issues/detail?id=12731
+  'regress/regress-crbug-1306929': [SKIP],
 }],  # variant == stress_snapshot and arch == x64
 
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