* (WIP) Alerting: Decrypt secrets before sending configuration to the remote Alertmanager
* refactor, fix tests
* test decrypting secrets
* tidy up
* test SendConfiguration, quote keys, refactor tests
* make linter happy
* decrypt configuration before comparing
* copy configuration struct before decrypting
* reduce diff in TestCompareAndSendConfiguration
* clean up remote/alertmanager.go
* make linter happy
* avoid serializing into JSON to copy struct
* codeowners