fix: spacing issue with exp list pagination

[johnkim-det]

Description

Minor follow up to #8956. Adding back spacing between Pagination component and DataGrid when infinite scroll is off.

Test Plan

Follow up to refactor PR, should not require additional testing for release.

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.63%. Comparing base (85bb3c8) to head (15b56fa).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9067      +/-   ##
==========================================
- Coverage   47.18%   40.63%   -6.55%     
==========================================
  Files        1152      831     -321     
  Lines      141773   102581   -39192     
  Branches     2417     2417              
==========================================
- Hits        66890    41685   -25205     
+ Misses      74693    60706   -13987     
  Partials      190      190              

Flag	Coverage Δ
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see 321 files with indirect coverage changes

[ashtonG]

does the gap not work if you wrap pagination in a row? having a spacer element seems yucky.

[johnkim-det]

does the gap not work if you wrap pagination in a row? having a spacer element seems yucky.

gap for row only works if there are multiple child elements, realized it makes more sense to have the gap applied to the wrapper

[emily-roses]

LGTM