port Monitoring core's 31 variables to FormSpec

CMK-36196

Change-Id: I9f5b5b16273dd6d427e3c5d2169aa23bdec0c652

Author: MakeilaLun

tests/testlib/unit/gui/config_variable_form_data_test_helper.py

@@ -646,8 +646,7 @@ def _walk_legacy_valuespec(vs: object, path: str, revealed: dict[str, object]) -
         "[add]": {"host": "127.0.0.1", "mangling": False, "port": 2003, "prefix": ""},
     },
     "cmc_real_time_checks": {
-        "[choice 0]": None,
-        "[choice 1]": {"port": 6559},
+        "[enable]": {"port": 6559},
     },
     "cmc_smartping_tuning": {
         "throttling": (10, 1000),