fix: mark users seen when activating on login (#21305)

fixes #21303

Update user last_seen_at when we mark them active on login. This prevents a narrow race where they can be re-marked dormant and fail to log in.

coderd/users.go

@@ -885,9 +885,10 @@ func (api *API) putUserStatus(status database.UserStatus) func(rw http.ResponseW
 		}
 
 		targetUser, err := api.Database.UpdateUserStatus(ctx, database.UpdateUserStatusParams{
-			ID:        user.ID,
-			Status:    status,
-			UpdatedAt: dbtime.Now(),
+			ID:         user.ID,
+			Status:     status,
+			UpdatedAt:  dbtime.Now(),
+			UserIsSeen: false,
 		})
 		if err != nil {
 			httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{