refactor: merge the products and product images directories for OFF, OBF, OPF and OPFF

[stephanegigandet]

In the last few weeks, we normalized product barcodes and deduplicated products that existed in multiple flavors (Open Food Facts, Open Beauty Facts, Open Product Facts and Open Pet Food Facts).

We are now going to merge the directories that contain product and product revision data (the .sto files) and the product images. We will keep separate MongoDB databases for each flavor.

This will:

• make it much easier to move products from one product type to another
• remove the possibility of having duplicate products on multiple flavors
• make it much easier to have read and write APIs that can be used to retrieve / update products of any type.

Deployment plan:

• stop OBF, OPF, OPFF for the duration of the migration (a couple of hours)
• update OFF code
• move products and product images dirs from OBF, OPF, OPFF to the OFF directory structure
• change the links to products and products of images on OBF, OPF, OPFF to use the OFF dirs
• restart OBF, OPF, OPFF with the new code

In this PR:

• code updates to check product_type when reading / editing a product for both the website and API. Redirect to the right flavor if the product type is different than the one of the server the request was made to.
• changed the product edit form to allow moderators to change the product_type
• keep support for moderators to put "obf" etc. in the change code field
• tests for the above
• small refactor to put into Config.pm things that are the same for all flavors and that are currently duplicated in Config_off.pm etc.

Will solve:

• Image transfer between OFF and OPF/OBF/OPFF #9221
• NEW DESIGN: Strange error message when moving products to a different server (e.g. Open Beauty Facts) #7539
• Create a new API that checks a barcode on all 4 databases #1174
• Create placeholder response if the product is present on Open (Beauty/PetFood/Products) Facts #497
• Add an option to move images to an OBF barcode in addition to an OFF barcode #320

[teolemon]

@stephanegigandet small test conflict

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud