fix(wc-subs-limiting): handle not-logged-in user

[adekbadek]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

A hotfix.

Amends #1728 to handle not-logged-in users, assuming their user ID from the email provided at checkout.

How to test the changes in this Pull Request:

1. Create or edit a subscription product – in the Advanced settings section, add limiting:

3. Purchase the subscription, then log out and purchase it again with the same email address
4. Observe the second subscription cannot be bought

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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[dkoo]

This functionally works well, but the error message isn't very helpful and also includes a link to the Shop page, which doesn't play well with the modal checkout iframe. Let's see if we can make this a bit more user-friendly

[dkoo]

6d40ff7 adds some filtering to make the error messaging a little clearer and more contextual when limiting purchase in the modal checkout:

[leogermani]

Looks and work well!

[adekbadek]

Assuming @dkoo 's contributions amount to an approval :)

[matticbot]

🎉 This PR is included in version 3.6.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[matticbot]

🎉 This PR is included in version 4.0.0-alpha.2 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

Your semantic-release bot 📦🚀