Issue:
Bug: fix(router): Move Customer PML endpoint to OLAP (v2)



[This PR](https://github.com/juspay/hyperswitch/pull/7241) added customer PML for v2, but the route was incorrectly added under OLTP instead of OLAP, need to fix

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Moved customer saved PML route to OLAP in v2

### Additional Changes

- [x] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
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Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
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Closes #8302 

## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
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Verified as working. No change in response.

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Testing:

Verified as working. No change in response.

Patch:
diff --git a/crates/router/src/routes/app.rs b/crates/router/src/routes/app.rs
index a22d71a5d66..a9cda83bd41 100644
--- a/crates/router/src/routes/app.rs
+++ b/crates/router/src/routes/app.rs
@@ -1080,6 +1080,10 @@ impl Customers {
                     web::resource("/total-payment-methods")
                         .route(web::get().to(payment_methods::get_total_payment_method_count)),
                 )
+                .service(
+                    web::resource("/{id}/saved-payment-methods")
+                        .route(web::get().to(payment_methods::list_customer_payment_method_api)),
+                )
         }
         #[cfg(all(feature = "oltp", feature = "v2"))]
         {
@@ -1091,10 +1095,6 @@ impl Customers {
                         .route(web::get().to(customers::customers_retrieve))
                         .route(web::delete().to(customers::customers_delete)),
                 )
-                .service(
-                    web::resource("/{id}/saved-payment-methods")
-                        .route(web::get().to(payment_methods::list_customer_payment_method_api)),
-                )
         }
         route
     }