Auth: Hide forgot password if grafana auth is disabled (#79895)

* hide forgot password if grafana auth is disabled

* fix test

pkg/api/dtos/frontend_settings.go

@@ -29,6 +29,8 @@ type FrontendSettingsAuthDTO struct {
 	GitLabSkipOrgRoleSync bool `json:"GitLabSkipOrgRoleSync"`
 	// Deprecated: this is no longer used and will be removed in Grafana 11
 	OktaSkipOrgRoleSync bool `json:"OktaSkipOrgRoleSync"`
+
+	DisableLogin bool `json:"disableLogin"`
 }
 
 type FrontendSettingsBuildInfoDTO struct {

pkg/api/frontendsettings.go

@@ -329,6 +329,7 @@ func (hs *HTTPServer) getFrontendSettings(c *contextmodel.ReqContext) (*dtos.Fro
 		GithubSkipOrgRoleSync:       parseSkipOrgRoleSyncEnabled(oauthProviders[social.GitHubProviderName]),
 		GitLabSkipOrgRoleSync:       parseSkipOrgRoleSyncEnabled(oauthProviders[social.GitlabProviderName]),
 		OktaSkipOrgRoleSync:         parseSkipOrgRoleSyncEnabled(oauthProviders[social.OktaProviderName]),
+		DisableLogin:                hs.Cfg.DisableLogin,
 	}
 
 	if hs.pluginsCDNService != nil && hs.pluginsCDNService.IsEnabled() {