CI: Run Phan against WooCommerce 7.0 stubs

[tbradsha]

Closes MONOREP-245

This PR runs Phan against WooCommerce 7.0 stubs. Supersedes #45986.

Proposed changes:

We've had a few cases where Jetpack releases have unleashed some fatals because an assumption that users ran fairly recent WooCommerce versions:

• p1759248959778399/1759158780.923629-slack-CK365S85V
• p1763478353571209/1763474992.105219-slack-CK365S85V
• p1759758846239149/1759158780.923629-slack-CK365S85V

If there's a need we could consider generating new woocommerce-internal stubs, but that'd be for another PR should we want.

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?
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Jetpack product discussion

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

Testing instructions:

Is CI happy?

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[anomiex]

Could we if we change the constraint in composer.json?

[tbradsha]

Do you mean in trunk like we do with WP stubs? We could; I personally lean toward keeping constraints tighter in there, but right now it's >=8.7, so if that's your preference I can do that.

[tbradsha]

Let's give it a go: e53acbb

[anomiex]

LGTM, and I see the downgrading in the logs for the second Phan run.