Disable test_shark_model_suite while it is failing. (#10578)

Follow-up to https://github.com/iree-org/iree/pull/10576 (see
https://github.com/nod-ai/SHARK/issues/373).

This PR should be reverted once the job succeeds again.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bfd1fa1..b1a5fbe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -455,7 +455,8 @@
   ##############################################################################
   test_shark_model_suite:
     needs: [setup, build_all, build_tf_integrations]
-    if: needs.setup.outputs.should-run == 'true' && needs.setup.outputs.ci-stage == 'postsubmit'
+    # Disabled while failing, see https://github.com/nod-ai/SHARK/issues/373
+    if: false && needs.setup.outputs.should-run == 'true' && needs.setup.outputs.ci-stage == 'postsubmit'
     runs-on:
       - self-hosted  # must come first
       - runner-group=${{ needs.setup.outputs.runner-group }}