Use basic redirect gateway when checkout smart buttons disabled (3347)

[AlexP11223]

Now when the smart buttons are disabled for checkout the basic redirect gateway is added instead (like the woocommerce_paypal_payments_use_place_order_button filter).

In block checkout it was already added by default unless disabled via the woocommerce_paypal_payments_blocks_add_place_order_method filter.

Also disabling this gateway when there is a subscription since it does not properly.

When the smart buttons are disabled for both classic checkout and block express checkout, the settings about subscriptions are hidden.

In settings.js I tried to refactor the toggleInputsBySelectedLocations function a bit since it is too big and difficult to understand.

[Narek13]

Thanks, LGTM