interop-testing: add googleapis and rls as interop client dependencies

The internal build rule for this client already adds these dependencies, and is what related tests for these dependencies have been relying on for a while.

We're starting to use the per-release published interop client docker images for those tests too now, and these use the gradle build rules.

interop-testing/build.gradle

@@ -23,9 +23,11 @@ dependencies {
             project(':grpc-auth'),
             project(':grpc-census'),
             project(':grpc-core'),
+            project(':grpc-googleapis'),
             project(':grpc-netty'),
             project(':grpc-okhttp'),
             project(':grpc-protobuf'),
+            project(':grpc-rls'),
             project(':grpc-services'),
             project(':grpc-stub'),
             project(':grpc-testing'),