Settings Synchronization: Clean up unused Stripe settings in the database

[hsingyuc]

After we start using Stripe settings, we no longer need the settings stored in the store database.

For example, this setting should be removed from the settings controller.

The amazon_pay setting stored in the database and upe_checkout_experience_accepted_payments should also be removed with a migration from the woocommerce_stripe_settings option.

The migration should also update settings from the database to Stripe settings to make sure the configuration stays the same for the merchant site.

Acceptance criteria

• No regressions occur with Stripe payment configuration settings.
• Payment method settings are no longer found in the database.
• Stripe payment configuration should be updated based on the current merchant settings.

Notes

• Blocked by Settings Synchronization : Fetch Stripe settings with Stripe configuration API #3916, Settings Synchronization: Amazon Pay #3917, Settings Synchronization: Apple Pay / Google Pay #3985, Settings Synchronization: Link and UPE #3986, and maybe Settings Synchronization: Track usage of settings changes #3920
• Create a PR based on the feature branch

[hsingyuc]

This issue can be combined with #4118.