Bug: [BUG] Payment Methods List filters not conscious of zero amount setup mandate payments



### Bug Description

When a payment method is enabled for a particular connector with a minimum amount of `> 0`, and a zero amount setup mandate payment intent is created, the payment method doesn't show up in the list payment methods call even though amount constraints are not eligible for setup mandate payments.

### Expected Behavior

The filters for list payment methods should skip amount checks if the payment is a setup mandate payment.

### Actual Behavior

The amount constraints are applied to the merchant's payment methods which cause them to not show up in the response of the list payment methods call.

### Steps To Reproduce

1. Create a Merchant Account with 1 Merchant Connector account and give minimum amount as zero for all enabled payment methods
2. Create a payment with amount = 0, confirm = false & no payment method given
3. Do a list payment methods call for the created payment intent

### Context For The Bug

-

### Environment

-

### Have you spent some time checking if this bug has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!
diff --git a/crates/router/src/core/payment_methods/cards.rs b/crates/router/src/core/payment_methods/cards.rs
index 84aef952a53..aaecd86627c 100644
--- a/crates/router/src/core/payment_methods/cards.rs
+++ b/crates/router/src/core/payment_methods/cards.rs
@@ -2237,7 +2237,7 @@ fn filter_amount_based(payment_method: &RequestPaymentMethodTypes, amount: Optio
     //     (Some(amt), Some(max_amt)) => amt <= max_amt,
     //     (_, _) => true,
     // };
-    min_check && max_check
+    (min_check && max_check) || amount == Some(0)
 }
 
 fn filter_pm_based_on_allowed_types(
@@ -2296,8 +2296,9 @@ fn filter_payment_amount_based(
     pm: &RequestPaymentMethodTypes,
 ) -> bool {
     let amount = payment_intent.amount;
-    pm.maximum_amount.map_or(true, |amt| amount < amt.into())
-        && pm.minimum_amount.map_or(true, |amt| amount > amt.into())
+    (pm.maximum_amount.map_or(true, |amt| amount <= amt.into())
+        && pm.minimum_amount.map_or(true, |amt| amount >= amt.into()))
+        || payment_intent.amount == 0
 }
 
 async fn filter_payment_mandate_based(

## 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 -->
This PR updates the List Payment Method core filters to allow payment intents with zero amount


### Additional Changes

- [ ] 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
<!--
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).
-->
Payment intents with zero amount are created for setting up a mandate with the connector and thus are a valid form of connector call.

## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
1. Create a Merchant Account, 1 Merchant Connector Account
2. Create a payment with amount = 0, confirm = false & no payment method given
3. Do a list payment methods call. The returned list should include all the eligible payment methods despite the amount being 0.

<img width="551" alt="image" src="https://github.com/juspay/hyperswitch/assets/47862918/577f1be7-e714-4951-97ea-2277ddebce6e">
<img width="551" alt="image" src="https://github.com/juspay/hyperswitch/assets/47862918/bfc67914-ee7c-4fc9-adbb-0e00ab17ff2a">


## 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
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable
