Correct quantity deduction for bundle products with duplicate options

[ahasAmp]

#142

Description

Bundle products containing duplicate selections (same SKU and quantity) did not result in correct stock deductions.
When the same option was included multiple times in a bundle (e.g., selected twice from different option groups), the system recognized both selections during checkout, but only deducted stock for one instance, resulting in under-deduction and inaccurate inventory.

Solution

We updated the bundle handling logic in the module to detect and consolidate duplicate option selections before stock deduction occurs. This ensures:
The correct total quantity is deducted from inventory.
Inventory stays consistent with the actual order contents.
A new acceptance test was also added to validate the fix: bundleWithDuplicateOptionsDeductsCorrectly

Checklist

• Pull request has a meaningful description of its purpose, include affected Magento versions if it is a bug.
• All commits are accompanied by meaningful commit messages
• Tests have been ran / updated (see ./dev/README.md for how to run tests)