Always run tests with lit internal shell

Author: ayylol

sycl/test-e2e/format.py

@@ -373,15 +373,12 @@ def get_extra_env(sycl_devices):
             conditions,
             recursion_limit=test.config.recursiveExpansionLimit,
         )
-
-        # TODO: workaround for lit hanging when executing non-existent binary
-        # inside our containers
         if len(script) == 0:
             return lit.Test.Result(lit.Test.UNSUPPORTED, "Lit script is empty")
-        useExternalSh = test.config.test_mode == "run-only"
 
+        # FIXME: will hang if trying to execute non-existant binary in our containers
         result = lit.TestRunner._runShTest(
-            test, litConfig, useExternalSh, script, tmpBase
+            test, litConfig, False, script, tmpBase
         )
 
         # Single triple/device - might be an XFAIL.