fix(payment_link): move redirection fn to global scope for open links

[kashif-m]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Described in #5495

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

How did you test it?

1. Create non 3DS open payment link

curl --location 'https://sandbox.hyperswitch.io/payments' \ --header 'Content-Type: application/json' \ --header 'Accept: application/json' \ --header 'api-key: API_KEY' \ --data-raw '{ "customer_id": "cus_05845u0qSuOENDnHLqTl", "amount": 100, "currency": "USD", "payment_link": true, "authentication_type": "no_three_ds", "connector": [ "stripe" ], "billing": { "address": { "line1": "1467", "line2": "Harrison Street", "line3": "Harrison Street", "city": "San Fransico", "state": "CA", "zip": "94122", "country": "US", "first_name": "John", "last_name": "Doe" }, "phone": { "number": "8056594427", "country_code": "+91" } }, "email": "john.doe@example.com", "session_expiry": 1000000, "return_url": "https://google.com", "payment_link_config": { "theme": "#14356f", "logo": "https://hyperswitch.io/favicon.ico", "seller_name": "HyperSwitch Inc." } }'

Complete the payment, and wait for redirection

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible