GH-29265: Fix errcheck errors in server/channels/app/platform/feature_flags.go (#29269)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -106,7 +106,6 @@ issues:
         channels/app/platform/busy_test.go|\
         channels/app/platform/cluster_handlers.go|\
         channels/app/platform/config_test.go|\
-        channels/app/platform/feature_flags.go|\
         channels/app/platform/helper_test.go|\
         channels/app/platform/license.go|\
         channels/app/platform/link_cache.go|\

server/channels/app/platform/feature_flags.go

@@ -46,7 +46,10 @@ func (ps *PlatformService) updateFeatureFlagValuesFromManagement() {
 	if oldFlags != newFlags {
 		ps.logger.Debug("Feature flag change detected, updating config")
 		*newCfg.FeatureFlags = newFlags
-		ps.SaveConfig(newCfg, true)
+		_, _, appErr := ps.SaveConfig(newCfg, true)
+		if appErr != nil {
+			ps.logger.Error("Failed to save config with updated feature flags", mlog.Err(appErr))
+		}
 	}
 }