Update Test Server Capabilities (#2226)

Author: Quinn-With-Two-Ns

temporal-test-server/src/main/java/io/temporal/internal/testservice/TestWorkflowService.java

@@ -547,6 +547,8 @@ public void getSystemInfo(
                     .setSignalAndQueryHeader(true)
                     .setEncodedFailureAttributes(true)
                     .setEagerWorkflowStart(true)
+                    .setUpsertMemo(true)
+                    .setNexus(true)
                     .build())
             .build());
     responseObserver.onCompleted();