[REFACTOR] remove non mandatory fields for Adyen Platform payouts

Hyperswitch mandates a few fields for AdyenPlatform connector which are not needed. These are needed to be made optional.

List of fields
- Billing address details
<think>
PR Context:
- Title: refactor(connector): make billing address line2 optional for Adyen Platform payouts
- Merged: None
- Files changed: 2 files
- Commits: 1 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [x] New feature
- [x] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->

Refactors the Adyen Platform connector to make the `billing.address.line2` field optional for payout operations, removing unnecessary validation that was causing friction for users.

**Key Changes:**
- Updated `AdyenAddress` struct to mak
</think>

To implement this, you'll need to modify:


(No detailed commit information available)
{"issue_number": 8973, "pr_number": 8981, "commits_count": 0, "files_changed": 2, "response_length": 797, "file_count": 1, "needs_breakdown": false}