fix: #1795 endpoints sample mustEmbedUnimplemented (#1798)
fix: #1795 endpoints sample mustEmbedUnimplemented (#1798)

Co-authored-by: Tyler Bui-Palsulich <09c8879d6bad3d9d62f59c1c5eee1ccd667498e4@users.noreply.github.com>
GoogleCloudPlatform/golang-samples,GoogleCloudPlatform/golang-samples,GoogleCloudPlatform/golang-samples