As a user, I am able to create a sub-task as a defect in a test run

As a user I am able to create a sub-task as a defect in a test run, when the sub-task doesn't have required fields other than the ones that are required by default.

Users can create sub-defects in the overall context and also in the context of test steps.

A new dialog must be provided by Xray that will allow users to specify the following fields for the sub-defects:

• Parent Issue* (defaults to the first requirement of the test, if it exists)
• Sub-Task Issue Type*
• Summary*
• Assignee
• Affects Versions (populated from the Test Execution issue)
• Fix Version
• Description (with the steps populated from the Test Run in case the defect is created in the context of a manual test step)

After the user selects the parent issue and the sub-Task issue type from the same project as the parent issue, if the issue has some other required fields that are not present the the list above, Xray must warn the user that the defect can not be created automatically by Xray.