fix: stepper: Handle decimal scrollLeft value for scroll buttons

[prathi-eightfold]

SUMMARY:

ScrollLeft property can have decimal values for systems using display scaling (ref). Handle decimal values when deciding to disable scroll buttons.

GITHUB ISSUE (Open Source Contributors)

JIRA TASK (Eightfold Employees Only):

https://eightfoldai.atlassian.net/browse/ENG-43824

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:

Before

Screen.Recording.2023-02-23.at.12.58.14.AM.mov

After

Screen.Recording.2023-02-23.at.12.58.27.AM.mov

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[dkilgore-eightfold]

Would be extra if you add a CSS modifier to give the small variant paddles some top margin. If not now, I can do this in a future change. You would need to account for horizontal vs vertical.

[codecov-commenter]

Codecov Report

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Additional details and impacted files

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  Hits            ?    14135           
  Misses          ?     2580           
  Partials        ?       66           

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