Ensure Square sync works without issues when using cached API response

[iamdharmesh]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

This PR makes improvements to syncing Square products. It includes the following changes:

• Fixed deserialization of cached API response data.
• Fixed a potential issue related to an infinite loop during inventory pull.
• Reduced the maximum object retrieval limit from 100 to 50 to better support sites with low-resource servers.

Steps to test the changes in this Pull Request:

1. Set up a Square dashboard with a large number of products (around 1k-5k).
2. Set up the Square extension and import products, ensuring that they are imported without any issues.
3. Perform a manual sync with Woo as the SOR and Square as the SOR, and ensure it works as expected.

Changelog entry

Fix – Ensure Square sync works without issues when using cached API responses.

[qasumitbagthariya]

QA Update ✅

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I have verified this PR in the enhancement/341 branch which has been fixed and is functioning as intended.

I tested the following on this branch:

• Verify with around 1k-5k produce and import / Sync

Testing Environment

• WordPress: 6.6.2
• Theme: Twenty Twenty-Four 1.2
• WooCommerce - 9.3.3
• PHP: 8.0.30
• Web Server: Nginx 1.20.2
• Browser: Chrome
• OS: macOS Ventura 13.3
• Branch: fix/sync-deserialize

Steps to Test- As mentioned in the PR description.
Test Results - It is working as expected.
Functional Demo / Screencast -
Special Notes - Ready for code review (Woo)
Testing Document status:
Cases related to this Issue/PR are added to the Critical Flow Wiki pages:

• Yes
• Not Required/Applicable for this PR

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