Use correct feature name for back compat.

[vedanshujain]

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:

We used the custom_order_tables everywhere for extensions to declare compatibility, instead of the option name. I accidentally added the option name in #40296 in one of the pre-flight checks. This means that HPOS would only be enabled by default only for those new sites, that do not already have any WC-related extension installed.

This fix includes those sites that have WC extensions installed before WC itself, as long as they are declared compatible with HPOS.

How to test the changes in this Pull Request:

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

1. On a new site, that never had WooCommerce installed, install an HPOS-compatible WC extension such as WooCommerce PayPal Payments
2. Install and activate WooCommerce from a zipped build with this PR.
3. Check that HPOS is authoritative by going to WooCommerce > Settings > Advanced > Features.

Also, it would be good to test out cases listed in #40296 to prevent regressionl.

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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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[github-actions]

Test Results Summary

Commit SHA: 0afde90

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	1m 3s
E2E Tests	205	0	0	7	0	212	19m 56s

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[github-actions]

Hi @Konamiman,

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