fix(python): Fix URL formatting + authorized key

[thomaspoignant]

Description

This PR fixes 2 things:

• Allow to set authorized key in the option if you use an authenticated version of GO Feature Flag
• Fix URL formatting when GOFF is not on the root level of the path.

Closes issue(s)

Resolve #2690 #2671

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have updated the documentation (README.md and /website/docs)
• I have followed the contributing guide

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.73%. Comparing base (0fcbe58) to head (ffaf084).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2707   +/-   ##
=======================================
  Coverage   84.73%   84.73%           
=======================================
  Files         111      111           
  Lines        5162     5162           
=======================================
  Hits         4374     4374           
  Misses        624      624           
  Partials      164      164           

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