REST API when importing execution results allow to pass any fields for Test creation

In all REST API endpoint that supports creation os TestExecution and even Tests (JUnit, Robot, TestNG, NUnit...) allow to pass any fields for Test creation. 

ACs:

• Multipart endpoints for importing execution results must also support importing a new JSON file to be used as a template for creating new test cases.
• Affected endpoints are:

• • JUnit XML results Multipart
  • TestNG XML results Multipart
  • NUnit XML results Multipart
  • Robot Framework XML results Multipart
• Xray must support a new parameter named "testInfo" to pass the JSON file containing the fields for creating Tests.
• The JSON file format is the same as Jira uses for the REST API (https://docs.atlassian.com/software/jira/docs/api/REST/8.2.0/?_ga=2.111455874.746998918.1558343025-232874918.1557136424#api/2/issue-createIssue)
• The "Summary" and "IssueType" fields will be overwritten by Xray.
• The "parent" field also makes no sense, as Tests can't be Sub-Tasks. Xray will ignore this field.
• Xray will return any error originated in Jira when creating Test cases.
• In case a project is provided in the "testInfo", the tests are created in that project unless there are no tests with the same Generic Test Definition across the Jira instance