Remove Venmo from the Shopper Insight Response

[tdchow]

Summary of changes

• Remove isVenmoRecommended from the ShopperInsightsInfo response object
• Remove merchant-facing analytics functions on ShopperInsightsClient
• Remove Venmo button on the Shopper Insights demo screen

Checklist

• ~[ ] Added a changelog entry~
• ~[ ] Relevant test coverage~

Authors

List GitHub usernames for everyone who contributed to this pull request.

PayPal and Braintree engineering requirements

If you're an engineer for PayPal or Braintree, complete this section. For PRs from the community, please ignore!

When do these changes need to be released? [ ] ASAP (let's discuss outside this PR) [ ] Soon, here's our target release date: <DD/MM/YYYY> [ ] Whenever, no rush