[BUG]: Add validation for primary_key in model ActiveRecord

[afthabvp]

validation for the primary key in the ActiveRecord model involves checking if the primary key exists for the source connector

model create payload

{
  "model": {
    "connector_id": 25,       // Replace with the appropriate connector_id
    "name": "users",          // Replace with the desired model name
    "query": "SELECT Id,User.Username, RecordType.Name, Account.AccountNumber, Account.OnboardedAccountNumber__c, PlannedVisitStartTime, PlannedVisitEndTime FROM Visit",  // Replace with the desired query
    "query_type": "soql",     // Replace with the desired query type
    "primary_key": "Id"
  }
}