tests: Add commented-out tests for PHP 8.2

[anomiex]

Changes proposed in this Pull Request:

We can't enable these since WP Core doesn't even support 8.1 yet, but we may as well include it alongside the commented-out 8.1 tests.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

None

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Nothing should change, this just adds some comments. But see the latest commit on actions: Reenable experimental PHP 8.1 run #22852 if you want.

[github-actions]

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