add context to getsignedinUser calls (#35963)

Signed-off-by: bergquist <carl.bergquist@gmail.com>

pkg/api/user.go

@@ -223,7 +223,7 @@ func ChangeUserPassword(c *models.ReqContext, cmd models.ChangeUserPasswordComma
 
 	userQuery := models.GetUserByIdQuery{Id: c.UserId}
 
-	if err := bus.Dispatch(&userQuery); err != nil {
+	if err := bus.DispatchCtx(c.Req.Context(), &userQuery); err != nil {
 		return response.Error(500, "Could not read user from database", err)
 	}