add mixin for dra device behaviour

[tomkane-dls]

add mixin for dra device behaviour
-> usbip devices should stop reconnecting and report loudly if FileNotFoundError is raised

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[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.53%. Comparing base (8cdee51) to head (0f62b58).

Files with missing lines	Patch %	Lines
src/fastcs/connections/connection.py	50.00%	2 Missing ⚠️
src/fastcs/connections/dra.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           refactor-issue-422     #430      +/-   ##
======================================================
- Coverage               94.59%   94.53%   -0.06%     
======================================================
  Files                      74       75       +1     
  Lines                    3905     3918      +13     
======================================================
+ Hits                     3694     3704      +10     
- Misses                    211      214       +3     

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