feat(connector): [jpmorgan] implement refund flow

[pixincreate]

Type of Change

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

Description

This PR implements refund flow for JPMorgan connector. Connector returns Authorized state (Pending). Post RSync call, the status gets updated to Success.

Additional Changes

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

Motivation and Context

The connector lacked this basic feature until now. Closes #8435

How did you test it?

Updated Cypress tests:

There exist an issue from the connector where it returns same transaction_id (connector_transaction_id) every single time which we have no control. Because of this, refunds tend to exceed the maximum refundable amount resulting in 4xx as shown below:

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by just clippy && jut clippy_v2
• I reviewed the submitted code
• I added unit tests for my changes where possible

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Changed Files

File	Status
crates/hyperswitch_connectors/src/connectors/jpmorgan/transformers.rs	38% smaller
crates/hyperswitch_connectors/src/connectors/jpmorgan.rs	29% smaller
cypress-tests/cypress/e2e/configs/Payment/Jpmorgan.js	0% smaller