Issue:
Bug: refactor(routing): remove payment_id from dynamic_routing metrics





Pull request description:
## Type of Change
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- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This will remove payment_id from being pushed to dynamic_routing metrics

### Additional Changes

- [ ] 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
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## How did you test it?
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This can be tested on SBX in the dynamic_routing Dashboard present on grafana dashboard,
There shouldn't be payment_id and the merchant_id should be merged with profile_id

## 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:

This can be tested on SBX in the dynamic_routing Dashboard present on grafana dashboard,
There shouldn't be payment_id and the merchant_id should be merged with profile_id

Patch:
diff --git a/crates/router/src/core/routing/helpers.rs b/crates/router/src/core/routing/helpers.rs
index 0250d00d1bb..aef89ea8ed9 100644
--- a/crates/router/src/core/routing/helpers.rs
+++ b/crates/router/src/core/routing/helpers.rs
@@ -733,7 +733,7 @@ pub async fn push_metrics_with_update_window_for_success_based_routing(
             .label
             .to_string();
 
-        let (first_success_based_connector, merchant_connector_id) = first_success_based_connector_label
+        let (first_success_based_connector, _) = first_success_based_connector_label
             .split_once(':')
             .ok_or(errors::ApiErrorResponse::InternalServerError)
             .attach_printable(format!(
@@ -753,17 +753,12 @@ pub async fn push_metrics_with_update_window_for_success_based_routing(
             &add_attributes([
                 ("tenant", state.tenant.tenant_id.clone()),
                 (
-                    "merchant_id",
-                    payment_attempt.merchant_id.get_string_repr().to_string(),
-                ),
-                (
-                    "profile_id",
-                    payment_attempt.profile_id.get_string_repr().to_string(),
-                ),
-                ("merchant_connector_id", merchant_connector_id.to_string()),
-                (
-                    "payment_id",
-                    payment_attempt.payment_id.get_string_repr().to_string(),
+                    "merchant_profile_id",
+                    format!(
+                        "{}:{}",
+                        payment_attempt.merchant_id.get_string_repr(),
+                        payment_attempt.profile_id.get_string_repr()
+                    ),
                 ),
                 (
                     "success_based_routing_connector",