LPS-35198 Remove duplicated code

This code has already been moved to the ExportImport JS component.
LPS-35198 Rename export_import_resources.jsp to import_layouts_resources.jsp
LPS-35198 Move the logic from export_import.jsp to the respective jsp
LPS-35198 Separate export view from export_import.jsp
LPS-35198 Create import view from export_import.jsp
LPS-35198 Merge import_options.jspf in import_layouts_resources
LPS-35198 allow users to export more than once (keep existing behavior)
LPS-35198 missing CMD on import
LPS-35198 remove unused code
LPS-35198 SF