Add background to FamilySearch Import Modal

[meisekimiu]

Add a background to the FamilySearch Import Modal, since it only had a transparent background. This was a style breakage caused by our migration to thew new CDK dialog.

Ideally this would be testable in Storybook but these components were not designed to be mocked very easily and efforts to put them in a Storybook story only ended in strange errors.

Steps To Test:

1. Go to apps and connect to FamilySearch
2. Import a family tree
3. Verify that all modals, in all steps of the process, have a background

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.62%. Comparing base (358328a) to head (23949c2).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #497      +/-   ##
==========================================
- Coverage   42.65%   42.62%   -0.03%     
==========================================
  Files         359      360       +1     
  Lines       10974    10986      +12     
  Branches     1793     1794       +1     
==========================================
+ Hits         4681     4683       +2     
- Misses       6133     6146      +13     
+ Partials      160      157       -3     

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[yeslikesolo]

I've tried connecting a familysearch account and keep running into this screen. I've tried making new permanent accounts on dev and link the new account, but each time I end up at this same screen.

[k8lyn6]

Hey @meisekimiu it looks like the modal doesn't scroll and goes off the page right now, at least on Chrome. I'm not able to see the full list, and there's no "submit" button or anything. See screenshot. I'd love for this to go out in tomorrow's deployment if we're able to do it, but it's okay if not!

@yeslikesolo once Natalie has made changes, can you take over QA for this? You have to deploy to staging because we can't test FamilySearch on dev. To deploy to staging, you build the branch just like you would on dev, just in the "Staging Build" tab. Then you'll have to manually deploy it yourself on the infrastructure page. Ping me if you have questions about it!

[meisekimiu]

I added a scrollbar to the middle of the modal so that the "Select Person(s) To Import" text and the buttons are always visible even if there's a long list of members.