fix(payment_method): update entity id used for Vault to global customer id

[prasunna09]

Type of Change

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

Description

Currently, if payment method data is inserted in vault for customer c1, merchant id is being sent as entity id, this will not allow us to store same payment method data for customer c2.
Payment Method data is always tied to customer, not to merchant.

Hence updated entity id to Global customer id

Additional Changes

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

Motivation and Context

How did you test it?

test case -

• create a payment method with 4242 card for a customer c1
• create new payment method with 4242 card for a customer c2
  Both api should return 200

Initially for a diff customer under same merchant, api is returning duplication error.
with this fix, the api should return 2xx

curl --location 'http://localhost:8080/v2/payment-methods' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'X-Profile-Id: profile id' \
--header 'Authorization: api-key=api key' \
--data '{
    "customer_id": "12345_cus_0197ca90d3797040985aceb3da929431",
    "payment_method_type": "card",
    "payment_method_subtype": "credit",
    "payment_method_data": {
        "card": {
            "card_number": "card_number",
            "card_exp_month": "12",
            "card_exp_year": "2026",
            "card_holder_name": "joseph Doe"
        }
    },
    "network_tokenization":{
        "enable":"Enable"
    }

}'

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]

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Changed Files

File	Status
crates/router/src/core/payment_methods.rs	70% smaller
crates/router/src/core/payment_methods/vault.rs	66% smaller
crates/router/src/core/proxy/utils.rs	5% smaller
crates/router/src/core/proxy.rs	0% smaller
crates/router/src/core/tokenization.rs	0% smaller
crates/router/src/types/domain.rs	0% smaller
crates/router/src/types/payment_methods.rs	0% smaller