Disable fail fast test mode by default

Author: msimacek

mx.graalpython/mx_graalpython.py

@@ -141,9 +141,6 @@ def get_boolean_env(name, default=False):
     "org.graalvm.tools.lsp.test",
 ])
 
-if CI and not os.environ.get("GRAALPYTEST_FAIL_FAST"):
-    os.environ["GRAALPYTEST_FAIL_FAST"] = "true"
-
 
 def is_collecting_coverage():
     return bool(mx_gate.get_jacoco_agent_args() or _COLLECTING_COVERAGE)