Issue:
Bug: [BUG] Payments list doesn't work with pagination parameters



### Context
- Currently the API accepts payment_id as pagination parameters for e.g starting_after = `pay_Ajabdhakjhah`
- However the underlying code relies on the auto-increment characteristic of databases
- While we do some sort of conversion here our pagination filters are based on `id` whereas the sort is `modified_at`
- This causes the response list to be not actually be paginated but return inconsistent & wrong results

#### Possible Solutions

- Either we can update the pagination filters to use `modified_at` (which can cause inconsistencies with data lists since `modified_at` can be changed)
- We can also try to sort out the list by incremental id


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
Sorted the payment list order in API response for descending based on `created_at` parameter. It allows the database fetches to be asycn and is collected in an hashmap and collected later in a descending order.


### Additional Changes

- [x] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
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## Motivation and Context
Fixes #1439.

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can focus on the implementation (unless its an obvious bug or documentation fix
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## 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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There were no new tests written (Although if needed we can write 1 test to check descending order in postman). But the endpoints behaviour was tested using postman.


## 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 submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable (Im not sure if this is needed)


Testing:

There were no new tests written (Although if needed we can write 1 test to check descending order in postman). But the endpoints behaviour was tested using postman.

Patch:
diff --git a/crates/router/src/core/payments.rs b/crates/router/src/core/payments.rs
index 384a2230389..c9bc3d0a649 100644
--- a/crates/router/src/core/payments.rs
+++ b/crates/router/src/core/payments.rs
@@ -1204,8 +1204,6 @@ pub async fn list_payments(
     merchant: domain::MerchantAccount,
     constraints: api::PaymentListConstraints,
 ) -> RouterResponse<api::PaymentListResponse> {
-    use futures::stream::StreamExt;
-
     use crate::types::transformers::ForeignFrom;
 
     helpers::validate_payment_list_request(&constraints)?;
@@ -1215,9 +1213,9 @@ pub async fn list_payments(
             .await
             .to_not_found_response(errors::ApiErrorResponse::PaymentNotFound)?;
 
-    let pi = futures::stream::iter(payment_intents)
-        .filter_map(|pi| async {
-            let pa = db
+    let collected_futures = payment_intents.into_iter().map(|pi| {
+        async {
+            match db
                 .find_payment_attempt_by_payment_id_merchant_id_attempt_id(
                     &pi.payment_id,
                     merchant_id,
@@ -1226,13 +1224,38 @@ pub async fn list_payments(
                     storage_enums::MerchantStorageScheme::PostgresOnly,
                 )
                 .await
-                .ok()?;
-            Some((pi, pa))
-        })
-        .collect::<Vec<(storage::PaymentIntent, storage::PaymentAttempt)>>()
-        .await;
+            {
+                Ok(pa) => Some(Ok((pi, pa))),
+                Err(e) => {
+                    if e.current_context().is_db_not_found() {
+                        logger::warn!(
+                            "payment_attempts missing for payment_id : {} | error : {}",
+                            pi.payment_id,
+                            e
+                        );
+                        return None;
+                    }
+                    Some(Err(e))
+                }
+            }
+        }
+    });
 
-    let data: Vec<api::PaymentsResponse> = pi.into_iter().map(ForeignFrom::foreign_from).collect();
+    //If any of the response are Err, we will get Result<Err(_)>
+    let pi_pa_tuple_vec: Result<Vec<(storage::PaymentIntent, storage::PaymentAttempt)>, _> =
+        join_all(collected_futures)
+            .await
+            .into_iter()
+            .flatten() //Will ignore `None`, will only flatten 1 level
+            .collect::<Result<Vec<(storage::PaymentIntent, storage::PaymentAttempt)>, _>>();
+    //Will collect responses in same order async, leading to sorted responses
+
+    //Converting Intent-Attempt array to Response if no error
+    let data: Vec<api::PaymentsResponse> = pi_pa_tuple_vec
+        .change_context(errors::ApiErrorResponse::InternalServerError)?
+        .into_iter()
+        .map(ForeignFrom::foreign_from)
+        .collect();
 
     Ok(services::ApplicationResponse::Json(
         api::PaymentListResponse {
diff --git a/crates/router/src/types/storage/payment_intent.rs b/crates/router/src/types/storage/payment_intent.rs
index 89bcafa08e0..b4ec4fe2b5a 100644
--- a/crates/router/src/types/storage/payment_intent.rs
+++ b/crates/router/src/types/storage/payment_intent.rs
@@ -40,7 +40,7 @@ impl PaymentIntentDbExt for PaymentIntent {
         // when https://github.com/rust-lang/rust/issues/52662 becomes stable
         let mut filter = <Self as HasTable>::table()
             .filter(dsl::merchant_id.eq(merchant_id.to_owned()))
-            .order(dsl::modified_at.desc())
+            .order(dsl::created_at.desc())
             .into_boxed();
 
         if let Some(customer_id) = customer_id {