Fix #13983: Improve custom option matching for multi-store imports

[satishashilwar]

• Modified _initOldCustomOptions() to include sort_order in existing option data
• Enhanced _findExistingOptionId() to match by type + sort_order first, then fallback to title matching
• This ensures options with same structure but different store titles are recognized as translations
• Fixes issue where multi-store CSV imports created duplicate options instead of proper translations

The fix maintains backward compatibility by keeping title-based matching as fallback.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

Resolved issues:

1. resolves [Issue] Fix #13983: Improve custom option matching for multi-store imports #40369: Fix Import custom option by CSV for multi store view #13983: Improve custom option matching for multi-store imports

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[satishashilwar]

@magento run all tests

[engcom-Hotel]

@magento create issue