Stripetest - remove call to deprecated function

[demeritcowboy]

Overview

Before

Call to function that:

1. Is deprecated since 1.5 years
2. All it does is create a payment processor
3. Stripe doesn't use it, and webform is the only thing in universe that uses it.

After

1. Just create a payment processor.
2. Also allow for getting the keys via ENV or a DEFINE, which while they are test keys makes it easier to hide them in github actions by using github secrets.

Technical Details

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