refactor(payment-link): use shouldRemoveBeforeUnloadEvents flag for handling removal of beforeunload events through SDK

[kashif-m]

Type of Change

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

Description

This PR enables a flag which enables HyperSwitch SDK to handle removal of beforeunload events based on it's consumption by the integrating merchants.

Additional Changes

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

Motivation and Context

This PR enables handling of removal of beforeunload events once checkout form is submitted by the user. Helps keep a clean user experience.

How did you test it?

Tested locally using payment links.

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

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/router/src/core/payment_link/payment_link_initiate/payment_link_initiator.js	0% smaller
crates/router/src/core/payment_link/payment_link_initiate/secure_payment_link_initiator.js	0% smaller

[hrithikesh026]

No core changes