The test run status of a test in a test execution is reset if the user adds again the already existent test to that same test execution from the Test Plan Board

Short Description: The test run status of a test in a test execution is reset if the user adds again the already existing test to that same test execution from the Test Plan Board.

Steps to Reproduce:
1 - Create a Test Plan.
2 - Add a Test to that Test Plan.
3 - Create a Test Execution from the Test Plan issue.
4 - Run that Test Execution.
5 - Go to the Test Plan Board of that Test Plan.
6 - Select that same Test and click "Add Tests to an Existent Test Execution".

Actual Result: The status of the test run is reset.
Expected Result: The status should not be reset.

7 - When doing the same, i.e. adding the already existent Test to the Test Execution issue from the Test Execution issue itself, this does not happen.