Add support to HPOS CLI tool for handling deleted orders

[jorgeatorres]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

Currently, when the cleanup tool is used, it'll attempt to compare the order from posts and also HPOS, and will fail when the order doesn't exist (on the HPOS side).
Given a prerequisite for using the cleanup tool is that HPOS is authoritative and sync is disabled, I believe it's safe to assume that those posts can be deleted.

This PR lets the cleanup tool remove meta for such posts and then delete the post itself if there's no corresponding order on the HPOS side.

Closes #45865 and #46592.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Make sure HPOS is enabled in WC > Settings > Advanced > Features and compatibility mode is disabled.
2. Create a few test orders on your site. Take note of the ID for at least two of those orders.
3. Sync orders by running wp wc hpos sync.
4. Manually "delete" one of the orders from step 2 by running this command:

   wp db query "DELETE FROM $(wp db prefix)wc_orders WHERE id = <order_id>"
   

5. Run wp wc hpos cleanup all to perform a cleanup and confirm the command runs successfully.
6. Run wp post meta list <order_id> for both IDs from step 2 and confirm that:
   • For the ID removed in step 4, the command fails with a "Could not find the post with ID XXX" which means the post was truly removed.
   • For the other ID, the list is empty (meaning all metadata was cleaned up).

Changelog entry

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Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

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Comment

[github-actions]

Hi @vedanshujain,

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[vedanshujain]

LGTM and tested well!