feat(keycloak): support for relative path and management relative path

[JotBePunkt]

When these parameters were set, the functions get_url() and get_management_url() did return the wrong URLs (without the prefix)

Now the implementation checks if the parameter is checked and adds it to the returned URL

This solves #964

[JotBePunkt]

@alexanderankin it would be great, if this change is in one of the next releases. What do we need to do to have this PR merged?

[alexanderankin]

i started rebasing a bigger PR yesterday, working through merging all the things

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.54%. Comparing base (83157eb) to head (8563d69).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #982   +/-   ##
=======================================
  Coverage   79.54%   79.54%           
=======================================
  Files          15       15           
  Lines        1281     1281           
  Branches      151      151           
=======================================
  Hits         1019     1019           
  Misses        218      218           
  Partials       44       44           

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