[WEB-5317] chore: enable multi-select for use case in onboarding flow

[anmolsinghbhatia]

Summary

Converts the use case selection in the onboarding flow from single-select to multi-select, allowing users to choose multiple use cases that describe how they plan to use Plane.

Type of Change

• Improvement
• Code refactoring

[makeplane]

Linked to Plane Work Item(s)

• [WEB-5317] Profile Avatar and Multi-Select Issue on Onboarding

This comment was auto-generated by Plane

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore-multi-select-use-case-onboarding-and-refactoring

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