Fix display of boolean fields in timeline activities

[ijreilly]

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after

[greptile-apps]

PR Summary

The pull request improves the display of boolean fields in timeline activities by utilizing a utility function for better code consistency.

• Modified packages/twenty-front/src/modules/activities/timelineActivities/rows/main-object/components/EventFieldDiffValueEffect.tsx to use isDefined from twenty-ui for null/undefined checks.
• Enhances code readability and consistency without introducing functional changes.
• No security issues or potential pitfalls identified with this update.

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