refactor(connector): [stripebilling] Change BillingConnectorPaymentSync from charges api to payment intents api.

[NISHANTH1221]

Change the url from charge api to stripes payment intent api.

[vaishnavi-cdf]

Hello @NISHANTH1221

I have contributed to your issue by updating the Billing Connector Payment Sync URL from the 'charges' API to the 'payment_intents' API. Please review the changes in the PR, and let me know if any further adjustments are needed.