* fix(dashboard version service): add DashboardUID to query and responses
The DashboardUID was not populated in the response from Get and ListDashboardVersions. This adds the DashboardUID to the Get query (it was already in List) and populated the DashboardUID in the returned DashboardVersionDTOs.
The DashboardVersion struct is the database object; the DashboardVersionDTO is the object that should be sent to the API layer.
In the future I'd like to move DashboardVersion to dashverimpl and un-export it, but there are a few places that Insert directly into that table, not all of which are test fixtures, so that should wait until we clean up at least the DashboardService's use of it.
* Split GetDashboarVersions method
* Add sqlstore dialect and tests
* Fix signature of PAtchPreference
* Add GetDialect to sqlstore and remove GetDashboardVersions
* Add GetDialect to db interface
* Implement List
* add deleted test function
* Remove GetDialect from sqlstore interface
* Remove deleted method from mock
* Refactor test
* Add store split for Get Dashboard version method
* Implement dashboard version service
* Fix api tests
* Remove GetDashboarVersion from sqlstore
* Add fakes for Get dashboard version
* Fix sqlstore test
* Add Get Dashboard store test
* Add dashver service test
* Remove useless comments
