* Make identity.Requester available at Context
* Clean pkg/services/guardian/guardian.go
* Clean guardian provider and guardian AC
* Clean pkg/api/team.go
* Clean ctxhandler, datasources, plugin and live
* Clean dashboards and guardian
* Implement NewUserDisplayDTOFromRequester
* Change status code numbers for http constants
* Upgrade signature of ngalert services
* log parsing errors instead of throwing error
* Make identity.Requester available at Context
* Clean pkg/services/guardian/guardian.go
* Clean guardian provider and guardian AC
* Clean pkg/api/team.go
* Clean ctxhandler, datasources, plugin and live
* Question: what to do with the UserDisplayDTO?
* Clean dashboards and guardian
* Remove identity.Requester from ReqContext
* Implement NewUserDisplayDTOFromRequester
* Fix tests
* Change status code numbers for http constants
* Upgrade signature of ngalert services
* log parsing errors instead of throwing error
* Fix tests and add logs
* linting
* Chore: Add user service method SetUsingOrg
* Chore: Add user service method GetSignedInUserWithCacheCtx
* Use method GetSignedInUserWithCacheCtx from user service
* Fix lint after rebase
* Fix lint
* Fix lint error
* roll back some changes
* Roll back changes in api and middleware
* Add xorm tags to SignedInUser ID fields
