xds: remove -v when running xds e2e tests (#7120)

Author: dfawley

xds/internal/test/e2e/run.sh

@@ -3,4 +3,4 @@
 mkdir binaries
 go build -o ./binaries/client ../../../../interop/xds/client/
 go build -o ./binaries/server ../../../../interop/xds/server/
-go test . -v
+go test .