fix: only pass base URL for the CredentialService

[paullatzelsperger]

What this PR changes/adds

This PR changes the url that is passed into the CredentialServiceClient to be just the base URL, as opposed to: the URL including the query endpoint.

Why it does that

Typically, these URLs are resolved from DIDs, that only should contain the base URL, because the actual endpoint is an implementation detail, that does not affect the DID.
For example, a bump in the API version would then cause all DIDs to be regenerated, which is nonsense.

Further notes

List other areas of code that have changed but are not necessarily linked to the main feature. This could be method
signature changes, package declarations, bugs that were encountered and were fixed inline, etc.

Linked Issue(s)

Closes # <-- insert Issue number if one exists

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ad100a6) 71.68% compared to head (91bb15b) 71.68%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3666   +/-   ##
=======================================
  Coverage   71.68%   71.68%           
=======================================
  Files         916      916           
  Lines       18415    18416    +1     
  Branches     1043     1043           
=======================================
+ Hits        13200    13201    +1     
  Misses       4757     4757           
  Partials      458      458           

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