Add --server flag for ecs client commands

[synfinatic]

Add support for connecting to a random server

Fixes: #937

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.81%. Comparing base (afaeeaf) to head (3479dfe).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #940      +/-   ##
==========================================
+ Coverage   83.77%   83.81%   +0.03%     
==========================================
  Files          41       41              
  Lines        2983     2989       +6     
==========================================
+ Hits         2499     2505       +6     
  Misses        391      391              
  Partials       93       93              

Flag	Coverage Δ
unittests	83.81% <100.00%> (+0.03%)	⬆️

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Files	Coverage Δ
internal/ecs/client/client.go	92.86% <100.00%> (+0.40%)	⬆️

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