Chore: Pass signed user_hash to Intercom via Rudderstack (#63921)

* move analytics identifiers to backend

* implement hash function

* grab secret from env

* expose and retrieve intercom secret from config

* concat email with appUrl to ensure uniqueness

* revert to just using email

* Revert "revert to just using email"

This reverts commit 8f10f9b1bc.

* add docstring

pkg/services/user/userimpl/store.go

@@ -432,6 +432,8 @@ func (ss *sqlStore) GetSignedInUser(ctx context.Context, query *user.GetSignedIn
 		if signedInUser.ExternalAuthModule != "oauth_grafana_com" {
 			signedInUser.ExternalAuthID = ""
 		}
+
+		signedInUser.Analytics = buildUserAnalyticsSettings(signedInUser, ss.cfg.IntercomSecret)
 		return nil
 	})
 	return &signedInUser, err