refactor: drop unused configuration

redirect_uri is set in the old Java client but it's
nowhere to be found Python and TS clients.

Also tests show that it's not required for exchanging tokens

Author: bevzzz

src/main/java/io/weaviate/client6/v1/internal/oidc/OidcConfig.java

@@ -5,13 +5,11 @@
 
 public record OidcConfig(
     String clientId,
-    String redirectUrl,
     String providerMetadata,
     List<String> scopes) {
 
-  public OidcConfig(String clientId, String redirectUrl, String providerMetadata, List<String> scopes) {
+  public OidcConfig(String clientId, String providerMetadata, List<String> scopes) {
     this.clientId = clientId;
-    this.redirectUrl = redirectUrl;
     this.providerMetadata = providerMetadata;
     this.scopes = scopes != null ? scopes : Collections.emptyList();
   }

src/main/java/io/weaviate/client6/v1/internal/oidc/OidcUtils.java

@@ -17,11 +17,11 @@ public final class OidcUtils {
   private OidcUtils() {
   }
 
-  private static final String OPENID_URL = "/.well-known/openid-configuration";
+  private static final String OPENID_CONFIGURATION_URL = "/.well-known/openid-configuration";
 
   private static final Endpoint<Void, OpenIdConfiguration> GET_OPENID_ENDPOINT = SimpleEndpoint.noBody(
       request -> "GET",
-      request -> "/.well-known/openid-configuration",
+      request -> OPENID_CONFIGURATION_URL,
       request -> Collections.emptyMap(),
       OpenIdConfiguration.class);
 
@@ -53,8 +53,6 @@ public static final OidcConfig getConfig(RestTransport transport) {
     } catch (IOException e) {
       throw new WeaviateOAuthException("fetch provider metadata", e);
     }
-
-    var redirectUrl = transport.getTransportOptions().baseUrl() + OPENID_URL;
-    return new OidcConfig(openid.clientId(), redirectUrl, providerMetadata, openid.scopes());
+    return new OidcConfig(openid.clientId(), providerMetadata, openid.scopes());
   }
 }

src/main/java/io/weaviate/client6/v1/internal/oidc/nimbus/NimbusTokenProvider.java

@@ -23,7 +23,6 @@ public final class NimbusTokenProvider implements TokenProvider {
   private final OIDCProviderMetadata metadata;
   private final ClientID clientId;
   private final Scope scope;
-  private final String redirectUrl;
   private final Flow flow;
 
   /**
@@ -79,7 +78,6 @@ private NimbusTokenProvider(OidcConfig oidc, Flow flow) {
 
     this.clientId = new ClientID(oidc.clientId());
     this.scope = new Scope(oidc.scopes().toArray(String[]::new));
-    this.redirectUrl = oidc.redirectUrl();
     this.flow = flow;
   }