`acccesscontrol.EvalAll` fails evaluation in certain cases

**Summary:** When joining scopes using `accesscontrol.EvalAll`, if some scopes require mutation and some do not, permission evaluation will fail (i.e. a user with permissions will be denied access) due to a resolver not existing for the scopes that do not require mutation. **Details:** https://github.com/grafana/grafana/pull/54208 introduced an error that's returned if no scope resolver is found when trying to mutate a scope after failing an initial short circuit evaluation. Unfortunately, https://github.com/grafana/grafana/pull/78289 exposed a problem where `folders:uid` scope inherited from a parent folder requires mutation while `datasources:uid` scope does not. This results in rules not being returned from the API that should be. Because the initial path guard does not check `datasource:query` the request succeeds, but when we later check it alongside the other permissions the permissions evaluation fails and no rules are returned.