Issue: Required fields absent in PML in case of Gift Card for OnSession (v2)

In case of `Adyen` connector and `Givex` payment method subtype, required fields are absent in PML output when `setup_future_usage` is `OnSession`

Need to move givex required fields to common in the required fields TOML

Resolution: <think>
PR Context:
- Title: fix(config): Set common required fields for Givex (v2)
- Merged: 2025-09-18T08:51:00Z
- Files changed: 1 files
- Commits: 1 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 -->
- Moved required fields for `givex` gift card for `Adyen` from `non-mandate` to `common`

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application confi
</think>

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