HM-437: Implement BDD test cases for JSON error handling with finalised scenarios for the TMC-MCCS

1. What this MR does / why we need it:

• Implement BDD test cases for JSON error handling with finalised scenarios for the TMC-MCCS
• XTP-34263 is the JIRA ticket created for same
• Some test cases are being skipped due to issues in the k8s-test job, which is a blocker for this story. This will be fixed as part of HM-443.

2. Make sure that you've checked the boxes below before you submit MR:

• No conflict with master branch.
• Merge Request Title appropriate.
• Unit/Integration tests added and existing test cases are passing.
• Variable and Function names state the purpose.
• There is no commented out code, print/debug statements.
• Logs are added wherever necessary.
• Exception is handled wherever required.