fix: e2e tests in pro version Codeinwp/visualizer-pro#418

[preda-bogdan]

Summary

Improved the filter conditions so that only one upsell is present for each category and that the upsell is not present when the pro plugin is active.

Added e2e tests for all upsells using the filter.

Note

Once this is merged into development the e2e tests from the PRO version should also pass.

Will affect the visual aspect of the product

NO

Screenshots

Test instructions

1. Check that all upsells work as before.
2. Check that the e2e pass.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes Codeinwp/visualizer-pro#418.

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🎉 This PR is included in version 3.10.9 🎉

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