fix: copy over functions from teams to reconnect expired subscriptions

[laurelfulford]

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:

The Newspack Plugin has an option to move On Hold subscriptions to Expired after a customizable period of time.

For publishers using Memberships for Teams, this causes an odd problem: the Teams plugin will 'deactivate' Teams when their associated Membership Subscription is cancelled/pending cancellation/expired. When the subscription is renewed, Teams will reattach the Team using a function called update_team_subscription_on_resubscribe(), but only in the first two cases (if the subscription is cancelled or pending cancellation). If it's expired, it does not.

Closes # .

How to test the changes in this Pull Request:

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?