…tion closes #30532

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Changes proposed in this Pull Request:

Closes #30532

What's happening here is that some sites deliberately "unset" WC created pages such as the My-Account or Shop page. When updating to WC 5.6, there is a migration process that creates the Refund and Return Policy page. However we did not account for sites to have some pages not set for these and so these pages can reappear. This PR filters into the page creation list and removes the rest and only leaving the Refund and Return Policy page.

How to test the changes in this Pull Request:

1. Go to /wp-admin/admin.php?page=wc-settings&tab=advanced and unset the My Account page or any of those pages and save.
   2 To trigger an db update you can change the woocommerce_db_version in the wp_options table to 5.5.0.
2. Reload the admin woocommerce area and now you should see the update database notice. Click to update.
3. After it is done and you see the "Thanks" notice, go back to /wp-admin/admin.php?page=wc-settings&tab=advanced and ensure the page you unsetted did not return.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?

Changelog entry

Fix - WC default pages are being re-created during db migration in some cases.

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.