Provide detailed reason for job timeout being reached

When a job times out, the Job Details pane shows the, "Job terminated due to timeout" but it doesn't state which timeout was hit. This can lead to confusion when setting the timeout on the job template to a value that is more than the global idle timeout value.

It would be helpful to display which timeout was hit, either timeout due to job template or timeout due to idle.

This can be achieved by displaying the reason for the timeout. For example, "Job terminated due to timeout" could be for when the job template timeout is reached and "Job terminated due to idle_timeout" could be for when the idle timeout is reached.

Github Link: https://github.com/ansible/awx/pull/13631