Resolve missing option labels in content library filters

[bjester]

Summary

Description of the change(s) you made

• @AllanOXDi and I cohacked on this
• Enforce that <MultiSelect> component requires the item-text prop to avoid using an empty string for selecting the key in the items array for option label display
• Updates other usages of the component to pass item-text, since they had the same issue

Manual verification steps performed

1. Signed into Studio
2. Opened 'Content Library'
3. Clicked 'Licenses' and 'Format' fields
4. Verified that option labels were present

Screenshots (if applicable)

Licenses	Formats

References

Fixes #3660

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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)
• All UI components are LTR and RTL compliant
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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

[marcellamaki]

lgtm!