[wasm] Disable flaky tests

The tests are flaky because of missing safepoint information for stack
checks. Adding the safepoint information there is not trivial though,
so I disable these tests for now to keep at least the bots green.
An alternative would be to revert the CLs that add safepoints in the
first place. However, I would prefer to avoid the overhead that would
be caused by it. The implementation is completely hidden behind a flag,
so it does not have impact on production code.

R=clemensb@chromium.org

Bug: v8:10929
Change-Id: I38c0e3c3806de2cc39ba26bc3b47c2ea8d1cf81a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2423705Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70056}

test/mjsunit/mjsunit.status

@@ -41,6 +41,10 @@
   ##############################################################################
   # Open bugs.
 
+  # https://crbug.com/v8/10929
+  'wasm/externref-liftoff' : [SKIP],
+  'wasm/externref-globals-liftoff' : [SKIP],
+
   # BUG(v8:2989).
   'regress/regress-2989': [FAIL, NO_VARIANTS, ['lite_mode == True', SKIP]],