Clean up PaymentFields implementation

[garthbrantley]

PRs: #243

• [ ] Remove styles related to Spreedly 3DS and other aspects of payments that were removed - For example: https://github.com/subscribepro/subscribepro-magento2-ext/blob/main/view/frontend/web/css/source/_module.less#L384
• [ ] Remove all extra console.logs - For example: https://github.com/subscribepro/subscribepro-magento2-ext/blob/main/view/frontend/web/js/view/payment/method-renderer/cc-form.js#L92
• [ ] Remove extra event handlers which aren't used - For example: 3DS2 is never used in admin checkout, so no 'challenge*' handlers needed
• [ ] All Spreedly, Spreedly iframe related code removed - For example: https://github.com/search?q=repo%3Asubscribepro%2Fsubscribepro-magento2-ext%20spreedly&type=code

[eugene-shab]

@garthbrantley Added clean-up for Payment Fields functionality on Checkout and Wallet pages.

Files that related to admin page was cleaned in different PR #214