[MM-32281] SqlRoleStore/GetByName: add context to allow read from master (#17176)

* role_store/GetByName: add context

* propagate context in the app layer

* propagate context in the app layer

* add missing import

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/role.go

@@ -56,7 +56,7 @@ func getRoleByName(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	role, err := c.App.GetRoleByName(c.Params.RoleName)
+	role, err := c.App.GetRoleByName(r.Context(), c.Params.RoleName)
 	if err != nil {
 		c.Err = err
 		return