[test] Skip flaky test

R=mstarzinger@chromium.org

Bug: v8:8781
Change-Id: I6982170a3e4c31a6d39e6368b7a3163dbb08cee7
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1451917Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59327}

test/mjsunit/mjsunit.status

@@ -232,6 +232,9 @@
 
   # BUG(v8:8169)
   'external-backing-store-gc': [SKIP],
+
+  # https://crbug.com/v8/8781
+  'compiler/string-from-code-point': [PASS, FAIL],
 }],  # ALWAYS
 
 ['novfp3 == True', {