As a user, I can bulk assign Test Runs of a Test Execution based on a field of the Test Issue

As a user, I can bulk assign Test Runs within a Test Execution based on a field of the Test Issue.

ACs:

• It should be possible to bulk assign Test Runs to a user based field of the corresponding Test Issue (such as the assignee or a different custom field with user type)
• It should also be possible to assign Test Runs to the current Test Execution assignee