[3.20.x] Rest-openapi contractFirst: rest configuration context-path should be favored as base-path

[JiriOndrusek]

Bug description

In case of the OpenApi contract first implementation as

restConfiguration()
                .apiContextPath("/api/openapi")
                .contextPath("/camel")
                .hostNameResolver(RestHostNameResolver.none);

        rest("/camel")
                .openApi()
                .specification("openapi/contract.json");

The rest endpoint does not work as expected. (curl http://localhost:8080/camel/${endpoint} returns 404).

This problem does not happen on main branch.

[JiriOndrusek]

Fix is proposed for the Camel for branch 4.10.x -> https://issues.apache.org/jira/browse/CAMEL-22296