Fix problem with infinite loop of redirects in API

[VygovskySergey]

#8953

[kushniryb]

@damianlegawiec
What's the reason behind redirecting from /products to v1/products?
Do we really need this functionality?
It's not apparent whether you've made a mistake or not due to the redirect and it introduces unnecessary complexity on top of it. Maybe it would be a good idea to remove this piece completely?

[damianlegawiec]

@kushniryb before Spree 3.1 API wasn't versioned. There's a LOT of integrations out there that rely on the API v1 to be available at https://example.com/api/orders.json - that's why this redirect was introduced.

[bbonislawski]

It's part of versioncake Gem. I think this whole thing should be deprecated(and extracted into separate gem) with Spree 4.x since everyone should use api v2

[damianlegawiec]

@bbonislawski yep, but until 4.0 we should keep this