Codesniffer: remove PHP 7.0 and 7.1 support

[tbradsha]

As the title says, it removes PHP 7.0 and 7.1 support, and updates the tests accordingly.

We should add PHP 8+ tests, but that will probably be after updating to PHPUnit 10+.

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

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

Testing instructions:

Verify CI is happy, or run tests manually: composer test-php

[github-actions]

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[zinigor]

Sweet exorcism! Also alphabetical ordering FTW 👍🏽

[zinigor]

Maybe in another universe :)

[tbradsha]

In this case, it's redundant to another rule. :^)

[tbradsha]

Also alphabetical ordering FTW

These are auto-generated files. That said, I wonder why the order is different...I suspect the default on my machine vs. Brad's is different. 🤔

Edit: I tried running it after using export LC_COLLATE=C but there were no changes when I did so. @zinigor @anomiex can you confirm the generated files on your end result in no changes in the files that are committed in this branch? Ideally generation would be consistent.

[anomiex]

can you confirm the generated files on your end result in no changes in the files that are committed in this branch?

Adding LC_ALL=C.UTF-8 at the top of the script makes it consistent with what you have here for me. So let's do that to make it consistent.

[anomiex]

Should we go ahead and add 8.4 right away, or save that for a followup?

[tbradsha]

I was figuring a separate PR, but no strong feelings.

[anomiex]

We should add PHP 8+ tests, but that will probably be after updating to PHPUnit 10+.

It's not PHPUnit that needs updating, it's phpcompatibility/php-compatibility. I'm not sure if PHP 8.0 checks still aren't finished or if the v10 release is now waiting on 8.4 checks, but either way there's no release to update to. 🙁 https://xkcd.com/2347/

[anomiex]

Let's do it.