Stop saving project as OPJ format

Version: 2023

Type: Features

Category: Miscellaneous

Subcategory: Ease of Use

Jira: ORG-25528

OPJ files saved in Origin 2023 will not be able to be opened in older versions that don’t support OPJU.

So we removed saving OPJ files from the menu and OriginC.

Old OPJ files can still be opened in 2023.