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fixes #623

Motivation and Context

The idea here is that instead of maintaining a List for ScenarioExecutionState, we will maintain a LInkedHashMap of StepExecutionState. This will make it easier to mutate ScenarioExecutionState in complex retry scenarios where previously successfully executed steps need to be re-executed (such as in the withSteps feature.

We can now run retries with previously executed steps like so:

   {
      "name" : "main",
      "url": "org.jsmart.zerocode.zerocodejavaexec.RetryTestUtility",
      "operation": "mainMethod",
      "request": "3",
      "retry": {
        "max": 3,
        "delay": 10,
        "withSteps": ["helper1","helper2", "helper3"]
      },
      "assertions": {
        "success": "true"
      }
    }

This will run the steps mentioned in withSteps in the order specified before retrying the step on failure.

Checklist:

• Unit tests added

• Integration tests added

• Test names are meaningful

• Feature manually tested

• Branch build passed

• No 'package.*' in the imports

• Relevant Wiki page updated with clear instruction for the end user

  • Not applicable. This was only a refactor change, no functional or behaviour changes were introduced

• Http test added to http-testing module(if applicable) ?

  • Not applicable. The changes did not affect HTTP automation flow

• Kafka test added to kafka-testing module(if applicable) ?

  • Not applicable. The changes did not affect Kafka automation flow