Give - Stripe Gateway 2.6.0

* New: Introducing a new way to connect with Stripe via Stripe Connect.
* New: Additional error checks and logs checks in place for Stripe ACH + Plaid payments.
* New: Added addition options to customize the Stripe modal checkout.
* New: Improved the donor experience when Stripe's checkout modal fades out after a successful payment that indicates the donation payment is processing.
* Tweak: Updated Plaid endpoints

* Fix: When a custom donation was given the gateway would incorrectly assign it as a donation level within the receipt despite the correct custom amount being processed.