Fix potential double delete crash

[mulugetam]

Prevents a double delete crash by making IAA and QAT jobs non-copyable. Currently, there is no such usage in the source code, and users are not expected to instantiate a IAA/QATJob themselves.

  QATJob job_1;
  job_1.GetQATSession(10, false);
  
  QATJob job_2 = job_1;
  job_1.CloseQATSession(10, false); 
  
  job_2.GetQATSession(10, false);  // this will cause a crash

[mulugetam]

Superseded by #43 and #44.