[Refactor]: [ACI] reuse utility functions from connector utils

Refactor Description

• In Hyperswitch, reusable and connector-agnostic functions used in connector integrations are added to crates/hyperswitch_connectors/src/utils.rs.

However, parts of the current ACI integration reimplement these functions instead of reusing them.

Possible Implementation

1. Review transformer.rs in the ACI connector to identify opportunities to reuse functions from crates/hyperswitch_connectors/src/utils.rs .

2. Replace the existing implementations with the corresponding reusable functions from the utils module where applicable.

Example

Current - shopper_result_url: item.router_data.request.router_return_url.clone(), Expected - shopper_result_url: item.router_data.request.get_router_return_url().ok(),

Have you spent some time checking if this feature request has been raised before?

• I checked and didn't find a similar issue

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to submit a PR?

None