fix(Modal): prevent double submit on primary button enter key

[adamalston]

Closes #10882

Prevented double submit on Modal primary button Enter key.

Changelog

Changed

• Prevented double submit on Modal primary button Enter key.

Testing / Reviewing

yarn test packages/react

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.26%. Comparing base (48ba19d) to head (7fccf75).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19151   +/-   ##
=======================================
  Coverage   84.25%   84.26%           
=======================================
  Files         388      388           
  Lines       14521    14524    +3     
  Branches     4787     4736   -51     
=======================================
+ Hits        12235    12238    +3     
- Misses       2126     2127    +1     
+ Partials      160      159    -1     

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