feat: Add Red Ventures event tracking to payment page

[julianajlk]

Adding Red Ventures event tracking for the payment MFE, which includes events on:

• PayPal Button clicks and viewed
• Place Order Button clicks and viewed
• Element viewed on Coupon promo banner

Note:

1. The Coupon promo banner is an ElementViewed of the alert banner but being treated as a ElementClicked event to the "Apply" button.

[grmartin]

You need to add ConversionTracked here.... See: https://github.com/edx/prospectus/blob/master/src/utils/cohesion/constants/tagular/events.ts#L10

The full events structure should be: https://github.com/edx/prospectus/pull/7366/files#diff-fb92d5744536e627aa25a0491348c6b15ecc9b675824e12097fa34379c9785f7R217

[julianajlk]

Example structure of a ConversionTracked event (this is just a console.log, not actually a Tagular Debug log):

[grmartin]

the name is blank for the product, should also be run through hyphenateForTagular but looks great otherwise

[julianajlk]

name in this case is the course title so it should not be hyphenated. It's null in local but should be populated in stage/prod

[grmartin]

hmm... ok, ive been told otherwise, but cool