fix(toast-notification): restore bottom margin on details container

[emyarod]

Closes #17523

This PR restores the bottom margin on the toast notification to the details div instead of the caption or subtitle. It also adds some visual regression tests

Changelog

New

• component test snapshots

Changed

• toast notification bottom margin placement

Testing / Reviewing

Confirm that the bottom margin of the toast notification does not collapse with different combinations of titles, subtitles, and captions of different length

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.03%. Comparing base (52b7061) to head (3287460).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17578   +/-   ##
=======================================
  Coverage   77.03%   77.03%           
=======================================
  Files         408      408           
  Lines       13993    13993           
  Branches     4353     4349    -4     
=======================================
  Hits        10779    10779           
- Misses       3041     3042    +1     
+ Partials      173      172    -1     

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[ariellalgilmore]

LGTM!