As a user, when importing execution results with JUnit JSON format, it should be possible to include any JIRA fields just like the JIRA REST API, by using a multipart endpoint

When importing execution results with the Xray REST API and the JUnit format, it should be possible to define any JIRA field to create/update the corresponding Test Execution issue.

For this, a new multipart endpoint shall be provided. One of the parts contains the XML report content corresponding to the test runs; the other part contains the info JSON content, related with the fields of the Test Execution. The later follows the syntax of JIRA REST api for updating/creating issues.

POST /api/v1/import/execution/junit/multipart

Example content of info JSON part, with the fields to be set in the Test Execution: 

{
    "fields": {
        "project": {
            "id": "10402"
        },
        "summary": "My Test Execution",
        "issuetype": {
            "id": "10007"
        },
        "components" : [
            {
            "name":"Interface"
            },
            {
            "name":"Core"
            }
        ]
    }
}