Skip jitless tests on builds without embedded builtins

Test mjsunit/regress/regress-992389 explicitly sets the jitless flag
when run.
Skip this test when run on builds without embedded-builtins.

Bug: v8:9632, chromium:992389
Change-Id: Ieb52a33006b1104080d8f5adb8c4f2c36e4413af
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1758317
Commit-Queue: Patrick Thier <pthier@google.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63240}

test/mjsunit/mjsunit.status

@@ -1094,4 +1094,9 @@
   '*': [SKIP],
 }], # variant == jitless and not embedded_builtins
 
+['not embedded_builtins', {
+  # Explicitly sets jitless flag.
+  'regress/regress-992389': [SKIP],
+}], # not embedded_builtins
+
 ]