feat: Add UI regex valiadation

Author: Arya Girish K

ibm_catalog.json

@@ -254,7 +254,14 @@
             },
             {
               "key": "instance_crn",
-              "required": true
+              "required": true,
+              "value_constraints": [
+                {
+                  "type": "regex",
+                  "description": "The value provided for 'existing_monitoring_crn' is not valid.",
+                  "value": "^crn:(.*:){3}sysdig-monitor:(.*:){2}[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}::$"
+                }
+              ]
             },
             {
               "key": "access_key",