fix: unhide mongodb_version from the DA (#742)

Author: ocofaigh

ibm_catalog.json

@@ -174,7 +174,7 @@
             },
             {
               "key": "mongodb_version",
-              "hidden": true,
+              "required": true,
               "default_value": "8.0",
               "options": [
                 {
@@ -580,7 +580,7 @@
             },
             {
               "key": "mongodb_version",
-              "hidden": true,
+              "required": true,
               "default_value": "8.0",
               "options": [
                 {