[CHORE] Avoid isDefined duplicated reference, move it to twenty-shared

[prastoin]

Introduction

Avoid having multiple isDefined definition across our pacakges
Also avoid importing isDefined from twenty-ui which exposes a huge barrel for a such little util function

In a nutshell

Removed own isDefined.ts definition from twenty-ui twenty-front and twenty-server to move it to twenty-shared.
Updated imports for each packages, and added explicit dependencies to twenty-shared if not already in place

Related PR #9941

[charlesBochet]

LGTM!

[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5591:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5562:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5571:7)�[39m
danger-results://tmp/danger-results-b9d65bb0.json

Generated by 🚫 dangerJS against ed1c1bf

[greptile-apps]

PR Summary

This PR consolidates the isDefined utility function by moving it from individual packages to twenty-shared, affecting multiple packages across the codebase.

• Moves isDefined implementation from twenty-front, twenty-server, and twenty-ui to twenty-shared package to avoid duplication
• Updates over 200 files to import isDefined from twenty-shared instead of local utilities or twenty-ui
• Adds export of isDefined in twenty-shared/src/index.ts and moves test file to shared package
• Removes isDefined.ts files from individual packages while maintaining identical functionality
• Fixes incorrect variant/accent prop handling in ButtonGroup.tsx where additionalProps.variant was being set twice

_{559 file(s) reviewed, 1 comment(s)
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[greptile-apps]

logic: Missing import for useIcons which was previously imported from twenty-ui

Suggested change

	export const WorkflowDiagramCanvasEditableEffect = () => {
	import { useIcons } from '@/ui/utilities/icons/hooks/useIcons';
	const { getIcon } = useIcons();