fix: popup: fixes pseudo element so it doesn't block cursor

[dkilgore-eightfold]

SUMMARY:

Ensures CSS pseudo selector doesn't block cursor when over Popup

popup.mp4

JIRA TASK (Eightfold Employees Only):

ENG-48127

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Pull the PR branch and run yarn and yarn storybook. Verify the Popup story behaves as expected.

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[codecov-commenter]

Codecov Report

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Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #590   +/-   ##
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  Coverage        ?   84.88%           
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  Files           ?      793           
  Lines           ?    17187           
  Branches        ?     6056           
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  Hits            ?    14590           
  Misses          ?     2531           
  Partials        ?       66           

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