Add tokenization key to demo app that is associated with merchant account that is configured for new PayPal checkout experience.
Requires settings "Tokenization Key", "PayPal Checkout Experience" and "Intent Type = Sale" to be set in demo app to launch new checkout experience from PayPal checkout flow
Prod tokenization key does not exist for this yet, but set up demo app at allow for one to be added easily
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~[ ] Added a changelog entry~
~[ ] Relevant test coverage~
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Checklist
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