When hiding not required fields such as "Assignee" and "Fix Version/s", these should not be displayed in the dialog of the Test Execution/Sub-Test Execution creation, a warning message should be displayed stating so and the issue should be created

Short Description: Currently, when hiding just one of the "Assignee" or "Fix Version/s" fields in the View Configuration Fields, the fields are still displayed in the Create Test Execution/Sub-Test Execution dialog and when entering a value in one of the fields, Jira displays an error message stating that the issue can not be created because those fields are hidden in the issue screen. Currently, when hiding both "Assignee" and "Fix Version/s" fields in the View Configuration Fields, the dialog displays an error that it can not retrieve the necessary information. 

What should happen instead is that only the hidden fields should not be visible in the screen, a warning message should be displayed stating that those fields are hidden and should be possible to create the issue. 

Steps to Reproduce:

1 - Navigate to the View Fields Configuration screen

2 - Hide the "Fix Version/s" field for example

3 - Navigate to a Test of a Project that has versions, then in the Test Runs section click to Execute in a New Test Execution

4 - Field "Fix Version/s" is displayed

5 - Enter a value and press "Create" button

Actual Result: Jira displays an error and does not create the Test Execution issue because the fields are hidden the the issue screen.

Expected Result: Only the fields that are hidden should be hidden in the dialog, an warning message should be displayed stating which fields are hidden (just the ones that are hidden) and should be possible to create the issue (see implementation of the Create Sub-Defect functionality)

6 - Now, hide the "Assignee" field

7 - Go to the Test and create a new Test Execution issue

Actual Result: An error message is displayed stating that the information can not be retrieved.

Expected Result: Only the fields that are hidden should be hidden in the dialog, an warning message should be displayed stating which fields are hidden (just the ones that are hidden) and should be possible to create the issue.