feat: add support to override gotty url

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

❌ Patch coverage is 25.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.36%. Comparing base (a38ba4a) to head (549e15c).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/gotty/client.go	0.00%	5 Missing ⚠️
...al/namespaces/instance/v1/custom_server_console.go	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5175      +/-   ##
==========================================
- Coverage   58.37%   58.36%   -0.01%     
==========================================
  Files         311      311              
  Lines       68500    68512      +12     
==========================================
+ Hits        39987    39990       +3     
- Misses      27028    27037       +9     
  Partials     1485     1485              

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