added text truncate in import channel dropdown

[Jaspreet-singh-1032]

Summary

Fixes#4166

Screenshots (if applicable)

---

Contributor's Checklist

PR process:

• If this is an important user-facing change, PR or related issue the CHANGELOG label been added to this PR. Note: items with this label will be added to the CHANGELOG at a later time
• If this includes an internal dependency change, a link to the diff is provided
• The docs label has been added if this introduces a change that needs to be updated in the user docs?
• If any Python requirements have changed, the updated requirements.txt files also included in this PR
• Opportunities for using Google Analytics here are noted
• Migrations are safe for a large db

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)
• All UI components are LTR and RTL compliant
• Views are organized into pages, components, and layouts directories as described in the docs
• Users' storage used is recalculated properly on any changes to main tree files
• If there new ways this uses user data that needs to be factored into our Privacy Policy, it has been noted.

Testing:

• Code is clean and well-commented
• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Any new interactions have been added to the QA Sheet
• Critical and brittle code paths are covered by unit tests

---

Reviewer's Checklist

This section is for reviewers to fill out.

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[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!