Remove unused variable in Environment.java and ServiceRestMetadataStorage.jar #5876
Description
Two code reported by LGTM, those issues need investigate
https://lgtm.com/projects/g/apache/dubbo/snapshot/001162d4f461e28561b01e2f90b15c1627706cf7/files/dubbo-common/src/main/java/org/apache/dubbo/common/config/Environment.java?sort=name&dir=ASC&mode=heatmap
https://lgtm.com/projects/g/apache/dubbo/snapshot/001162d4f461e28561b01e2f90b15c1627706cf7/files/dubbo-metadata/dubbo-metadata-processor/src/main/java/org/apache/dubbo/metadata/annotation/processing/rest/ServiceRestMetadataStorage.java?sort=name&dir=ASC&mode=heatmap