Feat: new suggestions endpoint

[ahuininga-orisha]

📝 Description

This PR adds support for the new Tweakwise Suggestions Items endpoint, replacing the deprecated Suggestions Products endpoint.

Reference: Tweakwise Suggestions Items Documentation

🧪 Testing Plan

Please perform the following tests for both grouped and non-grouped products to ensure no regressions and verify new functionality.

1. Regression Testing (Legacy Support)

Goal: Ensure existing suggestion logic remains functional.

Before switching to this branch:

• Override form.mini.phtml with a custom version (no specific changes required).
• Perform a search and note which suggestions are returned.

After switching to this branch:

• Verify that the returned suggestions match the results from the previous branch exactly.

2. New Functionality Testing

Goal: Verify the integration with the new Suggestions Items endpoint.

• In the Tweakwise backend, add new item types to the suggestions configuration.
• Ensure that items expected under these new types are correctly linked to their respective categories.
• Compare the suggestions displayed in the local environment with those in the Tweakwise Demoshop to ensure data parity.

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✅ Checklist

• Tested with Grouped products
• Tested with Non-grouped products
• Verified against Tweakwise Demoshop