[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
<think>
PR Context:
- Title: revert(routing): Add connectors from current active routing algorithm before adding fallback connectors
- Merged: None
- Files changed: 7 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 -->
Add fallback connectors to the list of eligible connectors for routing instead of connectors configured in the active routing rules
this PR reverts https://github.com/juspay/hyperswitch/pull/7921
To address failing CI checks, a commit was ch
</think>

To implement this, you'll need to modify:


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