[UPE] Remove the option under the Settings tab > General > Display settings > Name

[a-danae]

Describe the bug

With UPE enebled, the option Settings > General > Display settings, called "Name" is no longer used.

Before Split PE was implemented in 8.0.0, this string was used as a name for all of the payment methods that were displayed together as tabs under the Stripe gateway. As the description reads:

Enter the payment method name that will be displayed at checkout when there are multiple available payment methods.

Since 8.0.0, every payment method type has its own gateway, and this string is no longer used on the checkout page. It was used by WC_Stripe_UPE_Payment_Gateway previously.

This functionality will be re-introduced for the new Split PE implementation in #2993

To Reproduce
Steps to reproduce the behavior:

1. Enable UPE
2. Having EUR as the store currency, enable other payment method types besides Cards
3. Go to Stripe settings > Settings tab > General > Display settings
4. Take note of the value under the "Name" field

5. Go to the checkout page
6. Notice this string isn't displayed

Expected behavior

Since we're not using this setting anywhere, we wouldn't display it on our settings page.

We'll eventually introduce the same functionality that non-UPE has, where you can change the label for the payment methods. This functionality will be updated and re-introduced then.