Identity: Unfurl UserID and Email in pkg/api to user identity.Requester (#76112)

* Unfurl OrgRole in pkg/api to allow using identity.Requester interface

* Unfurl Email in pkg/api to allow using identity.Requester interface

* Update UserID in pkg/api to allow using identity.Requester interface

* fix authed test

* fix datasource tests

* guard login

* fix preferences anon testing

* fix anonymous index rendering

* do not error with user id 0

pkg/api/index.go

@@ -30,7 +30,9 @@ func (hs *HTTPServer) setIndexViewData(c *contextmodel.ReqContext) (*dtos.IndexV
 		return nil, err
 	}
 
-	prefsQuery := pref.GetPreferenceWithDefaultsQuery{UserID: c.UserID, OrgID: c.SignedInUser.GetOrgID(), Teams: c.Teams}
+	userID, _ := identity.UserIdentifier(c.SignedInUser.GetNamespacedID())
+
+	prefsQuery := pref.GetPreferenceWithDefaultsQuery{UserID: userID, OrgID: c.SignedInUser.GetOrgID(), Teams: c.Teams}
 	prefs, err := hs.preferenceService.GetWithDefaults(c.Req.Context(), &prefsQuery)
 	if err != nil {
 		return nil, err
@@ -81,7 +83,7 @@ func (hs *HTTPServer) setIndexViewData(c *contextmodel.ReqContext) (*dtos.IndexV
 	theme := hs.getThemeForIndexData(prefs.Theme, c.Query("theme"))
 
 	userOrgCount := 1
-	userOrgs, err := hs.orgService.GetUserOrgList(c.Req.Context(), &org.GetUserOrgListQuery{UserID: c.UserID})
+	userOrgs, err := hs.orgService.GetUserOrgList(c.Req.Context(), &org.GetUserOrgListQuery{UserID: userID})
 	if err != nil {
 		hs.log.Error("Failed to count user orgs", "error", err)
 	}
@@ -95,16 +97,16 @@ func (hs *HTTPServer) setIndexViewData(c *contextmodel.ReqContext) (*dtos.IndexV
 
 	data := dtos.IndexViewData{
 		User: &dtos.CurrentUser{
-			Id:                         c.UserID,
+			Id:                         userID,
 			IsSignedIn:                 c.IsSignedIn,
 			Login:                      c.Login,
-			Email:                      c.Email,
+			Email:                      c.SignedInUser.GetEmail(),
 			Name:                       c.Name,
 			OrgId:                      c.SignedInUser.GetOrgID(),
 			OrgName:                    c.OrgName,
-			OrgRole:                    c.OrgRole,
+			OrgRole:                    c.SignedInUser.GetOrgRole(),
 			OrgCount:                   userOrgCount,
-			GravatarUrl:                dtos.GetGravatarUrl(c.Email),
+			GravatarUrl:                dtos.GetGravatarUrl(c.SignedInUser.GetEmail()),
 			IsGrafanaAdmin:             c.IsGrafanaAdmin,
 			Theme:                      theme.ID,
 			LightTheme:                 theme.Type == "light",