fix(premium-newsletters): if available, use ESP_Sync to sync premium lists

[dkoo]

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:

Adds the ability to add or remove lists in queued ESP sync requests. See Automattic/newspack-newsletters#1997 for more details.

How to test the changes in this Pull Request:

See Automattic/newspack-newsletters#1997.

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?