fix(csharp): fix .net node redirection in tcp client

[lukaszzborek]

• fix node redirection after login
• add node redirection tests

[codecov]

Codecov Report

❌ Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.70%. Comparing base (effbab6) to head (2fc9ad1).

Files with missing lines	Patch %	Lines
...DK/IggyClient/Implementations/HttpMessageStream.cs	40.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2843      +/-   ##
============================================
+ Coverage     67.68%   67.70%   +0.01%     
  Complexity      739      739              
============================================
  Files          1031     1031              
  Lines         83912    83931      +19     
  Branches      60704    60715      +11     
============================================
+ Hits          56799    56823      +24     
+ Misses        24768    24758      -10     
- Partials       2345     2350       +5     

Flag	Coverage Δ
csharp	67.45% <91.17%> (+0.20%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...SDK/IggyClient/Implementations/TcpMessageStream.cs	76.55% <100.00%> (+3.03%)	⬆️
...DK/IggyClient/Implementations/HttpMessageStream.cs	71.72% <40.00%> (-0.40%)	⬇️

... and 5 files with indirect coverage changes

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