feat(content-picker): migrate selectionCellRenderer test to RTL

[devin-ai-integration]

Description

Migrated selectionCellRenderer.test.js from Enzyme to React Testing Library.

Changes:

• Replaced Enzyme imports with RTL imports from test-utils
• Updated test assertions to use RTL queries and matchers
• Improved accessibility by using proper ARIA roles
• Removed Enzyme-specific selectors and assertions

All tests are passing locally.

Link to Devin run: https://app.devin.ai/sessions/c547d22d4ba445cdb118a2c4010077a1
User: Joseph

[devin-ai-integration]

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[devin-ai-integration]

Closing due to inactivity.