Data Index GraphQL query fails when using non-default HTTP base path

[cmarques]

Description

When running Kogito with quarkus.http.root-path set to a value other than the default of /, the Process SVG Addon executes a request to the Data Index Service without taking into the account the quarkus.http.root-path that was set.
If the quarkus.http.root-path is set to /kogito, the request will still be made to /graphql, instead of /kogito/graphql.

Steps to reproduce

1. Set a non-default root path with quarkus.http.root-path=/kogito
2. Trigger an instance for <PROCESS_ID>
3. Execute the request to get the SVG of the Process Instance (replace <PROCESS_INSTANCE_ID> with the id returned from the previous request in step 2):
   curl -X 'GET' 'http://localhost:8080/kogito/svg/processes/<PROCESS_ID>/instances/<PROCESS_INSTANCE_ID>' -H 'accept: */*'

Expected behavior

SVG of <PROCESS_INSTANCE_ID>

Actual behavior

{"message":"Cannot invoke \"java.util.List.stream()\" because \"nodes\" is null"}

Environment

• Kogito version: 10.0.0

Additional Context

The request in question appears to be located at:
https://github.com/apache/incubator-kie-kogito-runtimes/blob/440d8a6616c896d843470f5375dce7bbca572d72/quarkus/addons/process-svg/runtime/src/main/java/org/kie/kogito/svg/dataindex/QuarkusDataIndexClient.java#L79