Issue: [FIX] Add fallback connectors instead of active routing rule connectors if straight through connector is ineligible

Add the fallback connectors to the list of eligible connectors instead of adding connectors configured in the active routing rule in case straight through connector is ineligible

Resolution: <think>
PR Context:
- Title: revert(routing): Add connectors from current active routing algorithm before adding fallback connectors
- Merged: 2025-06-04T16:36:28Z
- Files changed: 1 files
- Commits: 2 commits

Implementation approach:
## 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 -->
Reverts https://github.com/juspay/hyperswitch/pull/7921

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** revert(routing): Add connectors from current active routing algorithm before adding fallback connect
Files to modify:


**crates/router/src/core/payments.rs**
  Modify existing code