feat: Support Regex validation for custom attributes (#7856)

This allows a user to add/update a custom regex and a cue while defining custom attributes(Only applicable for type- text).
While adding/editing custom attributes, the values are validated against the attribute definition regex, and if it is incorrect, a cue message or default error message is shown and restricts invalid values from being saved.

Fixes: #6866

app/javascript/dashboard/i18n/locale/en/contact.json

@@ -339,7 +339,8 @@
     },
     "VALIDATIONS": {
       "REQUIRED": "Valid value is required",
-      "INVALID_URL": "Invalid URL"
+      "INVALID_URL": "Invalid URL",
+      "INVALID_INPUT": "Invalid Input"
     }
   },
   "MERGE_CONTACTS": {