PROTON-2598 Specify the location of generated resources for shade plugin

Configure the shade plugin in the performance tests to output the reduced pom
in the build directory so it will be removed by a clean later.
diff --git a/protonj2-performance-tests/pom.xml b/protonj2-performance-tests/pom.xml
index 9f784f3..4146e93 100644
--- a/protonj2-performance-tests/pom.xml
+++ b/protonj2-performance-tests/pom.xml
@@ -63,6 +63,7 @@
             </goals>
             <configuration>
               <finalName>protonj2-performance-tests</finalName>
+              <dependencyReducedPomLocation>${project.build.directory}/dependency-reduced-pom.xml</dependencyReducedPomLocation>
               <transformers>
                 <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                   <mainClass>org.openjdk.jmh.Main</mainClass>