[frontend] Bad margin/padding on some pages with an information section (#10053)

[SarahBocognano]

Proposed changes

• Remove "noMargin" props in breadcrumbs
• Add a marginBottom to alert component

Related issues

• Bad margin/padding on some pages with an information section #10053

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.31%. Comparing base (fbfcc97) to head (29c180c).
Report is 11 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10140   +/-   ##
=======================================
  Coverage   64.31%   64.31%           
=======================================
  Files         656      656           
  Lines       63048    63048           
  Branches     6990     6993    +3     
=======================================
  Hits        40552    40552           
  Misses      22496    22496           

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