Use weakref.finalize() to shutdown server connection

[pkrull-ansys]

Closes #508

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.26%. Comparing base (d953dc1) to head (825f405).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ditive/core/server_connection/server_connection.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #580   +/-   ##
=======================================
  Coverage   97.26%   97.26%           
=======================================
  Files          34       34           
  Lines        3395     3401    +6     
=======================================
+ Hits         3302     3308    +6     
  Misses         93       93           

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