fix(cdevents-webhooks) : Adding support for Artifact Constraints and Parameters

[rjalander]

This PR includes the changes to fix the CDEvents type Automated trigger to run the pipeline executions with Artifact Constraints and Parameters.

The structure of the CDEvents is defined in the CDEvents-spec

The sample CDEvent data with Parameters in the customData object

{
  "context": {
    "id": "5fb38d7d-28dd-47e4-ade2-cb21153cc8dc",
    "type": "dev.cdevents.artifact.published.0.1.0",
    "source": "https://ci-build.est.tech/",
    "version": "0.1.2"
  },
  "customData": {
    "parameters": {
      "stack": "prod"
    }
  },
  "customDataContentType": "application/json",
  "subject": {
    "type": "ARTIFACT",
    "content": {
      "pipelineName": "test-1",
      "outcome": "SUCCESS"
    }
  }
}

Sample CDEvent data with artifacts in the customData object

{
  "context": {
    "id": "5fb38d7d-28dd-47e4-ade2-cb21153cc8dc",
    "type": "dev.cdevents.artifact.published.0.1.0",
    "source": "https://ci-build.est.tech/",
    "version": "0.1.2"
  },
  "customData": {
    "artifacts": [
      {
        "type": "custom/object",
        "name": "image-cdevents",
        "version": "1.0.1",
        "reference": "custom/object/artifact"
      }
    ]
  },
  "customDataContentType": "application/json",
  "subject": {
    "type": "ARTIFACT",
    "content": {
      "pipelineName": "test-1",
      "outcome": "SUCCESS"
    }
  }
}

Dependent PR : spinnaker/gate#1732

[spinnakerbot]

The following commits need their title changed:

• a4e527d: CDEvents webhook trigger with artifacts and parameters support

• d41b3f1: removing the test file

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[rjalander]

@jasonmcintosh Can you please merge this if there are no other comments. Thank you.