Fix prevent strtotime PHP deprecated

[crodriguezbrito]

Proposed changes

This PR addresses the deprecated error from the strtotime() function in PHP.

PHP Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated

The issue occurs when making an API call to the WooCommerce Store API (/wc/v3/products). This deprecated error is triggered if there are no products created on the site. The reason is that the API uses $product_query->get_last_modified(), which lacks error handling for cases where no products exist.

This PR will use the WooCommerce REST API endpoint (/wc/v3/products), which does not trigger the deprecated error.

Type of Change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Video

Checklist

• I have read the CONTRIBUTING doc
• I have viewed my change in a web-browser
• Linting and tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[wpscholar]

@aratidgr8 Do you mind testing this PR?

[aratidgr8]

@wpscholar Hey,

Myself & @amruthabs22 have tested below flows with new api call /wc/v3/products and it works fine without any errors / warnings

1. No existing product
2. Add product
3. Manage products

Thanks!

CC: @crodriguezbrito