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 58.19%. Comparing base (1fb9756) to head (6de4e3a).
✅ 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   58.20%   58.19%   -0.01%     
==========================================
  Files         310      310              
  Lines       67448    67460      +12     
==========================================
+ Hits        39258    39261       +3     
- Misses      26731    26740       +9     
  Partials     1459     1459              

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