Iss #31 - Fix pagination calls for common edge case

Current code will fail if the query string starts with the page data. This should address this issue, and also adds testing to help guard against regression.

core/src/main/java/org/eclipsefoundation/core/service/impl/DefaultAPIMiddleware.java

@@ -48,7 +48,7 @@ import io.quarkus.arc.Unremovable;
 @Unremovable
 public class DefaultAPIMiddleware implements APIMiddleware {
     public static final Logger LOGGER = LoggerFactory.getLogger(DefaultAPIMiddleware.class);
-    private static final Pattern PAGE_QUERY_STRING_PARAM_MATCHER = Pattern.compile(".*[\\?&]page=(\\d+).*");
+    private static final Pattern PAGE_QUERY_STRING_PARAM_MATCHER = Pattern.compile("(?:^page=|.*&page=)(\\d+).*");
 
     @Inject
     ObjectMapper objectMapper;