[Payments onboarding] Payments setup webview enhancements

[jaclync]

For "plugin not setup" and "Stripe overdue" onboarding states:

• [ ] Bigger size p1730906102006189-slack-C070SJRA8DP
• [ ] If we have to use Safari sheet, look into disabling either Done/Cancel CTA p1730906183347639-slack-C070SJRA8DP. This might not be necessary if the authentication issue is fixed for the authenticated webview attempt https://github.com/woocommerce/woocommerce-ios/pull/14252
• [ ] Disable interactive dismissal for the webview, it's easy to accidentally drag slightly to dismiss the form while I was filling the form

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.