* Remote Alertmanager: Use the same struct for Grafana stat and Mimir full state
* Alertmanager: Add methods to merge nflog and silences
* update grafana/alerting version
* make update-workspace
* update mocks
* remove unnecesary methods from the remote Alertmanager implementation, create separate StateMerger interface
* (WIP) Remote Alertmanager: Optionally merge remote state before starting the internal Alertmanager
* cleanup ngalert.go
* restore defaults.ini
* move state parsing logic to 'remote' package, clean up ngalert.go
* remove GetBase, implement MegeNflog and MergeSilences
* delete fmt.Println
* FetchRemoteState -> GetRemoteState
* UserGrafanaState -> UserState
* remove duplicate clusterpb import
* reorder MimirClient interface
* use general getState() method for Grafana state and Mimir full state
* remove unnecessary state merging methods from the Alertmanager interface
* remove pullState field
* reduce diff
* add info log after merging
* merge silences and nflog entries in the same method
* merge the remote state in the forked AM
* reduce diff
* update remote AM mock
* tests
* make error more specific
* typo
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