Delete Redundant Command

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confirm above files whether using or not

• BuildWorldHeritageLocalDb.php → WorldHeritageBuild
• BackfillStateParties.php
• BackfillThumbnailImageId.php
• ImportWorldHeritageFromJson.php
• MakeManualSiteNamesJson.php
• SplitCountryJson.php
• SplitWorldHeritageImageJson.php
• DumpWorldHeritageSiteJapaneseName.php