FIX: Close on exit unless asked not to

[SMoraisAnsys]

When adding the action of closing AEDT through atexit.register, the case with close_on_exit=False was not handled.
This should fix this behavior.

Close #5273

@AlfVII Can you give a try at this PR to see if it fixes your problem ?

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[AlfVII]

Works :)

[AlfVII]

It fixes my issue :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.26%. Comparing base (7e793f9) to head (d6a5a34).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5292   +/-   ##
=======================================
  Coverage   83.26%   83.26%           
=======================================
  Files         143      143           
  Lines       58471    58471           
=======================================
  Hits        48683    48683           
  Misses       9788     9788