added text truncate in import channel dropdown

[Jaspreet-singh-1032]

Summary

Fixes #4166

Screenshots (if applicable)

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Contributor's Checklist

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Studio-specifc:

• All user-facing strings are translated properly
• The notranslate class been added to elements that shouldn't be translated by Google Chrome's automatic translation feature (e.g. icons, user-generated text)
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Reviewer's Checklist

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• Automated test coverage is satisfactory
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• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
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[MisRob]

Thanks @Jaspreet-singh-1032 for another contribution, this is very helpful

[LianaHarris360]

Thank you for working on this! The text is truncated appropriately in this case, however, because MultiSelect is a component used in other areas of Studio, setting max-width: 200px seems to also affect the /settings/#/storage page where this component is also applied:

[Jaspreet-singh-1032]

Hey @LianaHarris360, Thanks for the review. I have some queries. Without setting fixed width this does not seem to work because using ellipsis needs a specific width. What I am thinking is to pass a prop to the MultiSelect component that whether it should use ellipsis or not and if yes then what should be the max-width Let me know if you have any other suggestions!

[LianaHarris360]

@Jaspreet-singh-1032 Good idea, that sounds like it should work!

[LianaHarris360]

The code changes all make sense and it looks great!