[PayPal] Rename PayflowProToken type

[YevSent]

The PayflowProToken type represents the output type for createPayflowProToken mutation. The output type represents not only token itself but also other fields and also should have a name consistent to other output types.

Proposed solution

• Deprecate PayflowProToken via comments in GraphQL schema docs
• Introduce a replacement CreatePayflowProTokenOutput.

[lenaorobei]

AC:

• if this field was already released, it is marked as deprecated instead of removing
• covered with api-functional tests