[REFACTOR] remove redundant fields from webhook_details API and DB models

Below fields are a part of WebhookDetails during merchant account creation / updation AND profile creation / updation.

pub payment_created_enabled: Option<bool>,
pub payment_succeeded_enabled: Option<bool>,
pub payment_failed_enabled: Option<bool>,

These fields are not being used in the backend flows and are redundant. These are needed to be removed for keeping the APIs clean.

Currently, they're being consumed in a few components

• hyperswitch-control-center
• hyperswitch postman tests
• hyperswitch cypress tests

Once dependency on these fields is completely removed, these fields can be removed from API and DB models.