fix(ras-acc): ensure variable modal added to ras overlays

[chickenn00dle]

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:

Closes https://app.asana.com/0/1207817176293825/1207922674964414/f

This PR adds variation modals to ras overlays to ensure there aren't any overlapping popups:

Note: I accidentally pushed these changes directly to epic/ras-acc, but have reverted in 2f16c97 🤦

How to test the changes in this Pull Request:

1. Set up a delayed overlay campaign for any segment of user
2. On a post or page the campaign targets add a checkout button for a variable product, allowing the reader to select variation
3. As a reader targeted by the campaign, visit the page or post and click the checkout button to bring up the variation modal. Don't make a selection.
4. On epic/ras-acc, the prompt will appear below the variation modal as pictured above. On this branch it wont.

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?

[laurelfulford]

Looks good! You beat me to the feedback about this with the Newspack Popups PR AND beat me to fixing the close button on the variation modal 😆

[chickenn00dle]

Thanks again @laurelfulford!

You beat me to the feedback about this with the Newspack Popups PR AND beat me to fixing the close button on the variation modal

Sorry! I should have communicated the changes better. Hopefully I didn't waste too much of your time 🙏

[laurelfulford]

No worries! 😄 Both were small, and I would've figured it out if I had skimmed all of the PRs up for review before I dove in!