fix: repr for auth objects

PersonalAccessTokenAuth repr was malformed. Fixing it to be
more representative and show the actual class name used
in cases where the client user decides to subclass.

Author: jorwoods

tableauserverclient/models/tableau_auth.py

@@ -87,7 +87,7 @@ def __repr__(self):
             uid = f", user_id_to_impersonate=f{self.user_id_to_impersonate}"
         else:
             uid = ""
-        return f"<Credentials username={self.username} password=redacted (site={self.site_id}{uid})>"
+        return f"<{self.__class__.__qualname__} username={self.username} password=redacted (site={self.site_id}{uid})>"
 
 
 # A Tableau-generated Personal Access Token
@@ -155,8 +155,8 @@ def __repr__(self):
         else:
             uid = ""
         return (
-            f"<PersonalAccessToken name={self.token_name} token={self.personal_access_token[:2]}..."
-            f"(site={self.site_id}{uid} >"
+            f"<{self.__class__.__qualname__}(name={self.token_name} token={self.personal_access_token[:2]}..."
+            f"site={self.site_id}{uid}) >"
         )