[UI] Color picker dialog exposure

[pplaskie]

📝 Description

This pr contains changes required for Geti Prompt - component is exposed in @geti/ui and proper changes were made to be able to use this component in medium size.

✨ Type of Change

Select the type of change your PR introduces:

• 🐞 Bug fix – Non-breaking change which fixes an issue
• 🚀 New feature – Non-breaking change which adds functionality
• 🔨 Refactor – Non-breaking change which refactors the code base
• 💥 Breaking change – Changes that break existing functionality
• 📚 Documentation update
• 🔒 Security update
• 🧪 Tests

🧪 Testing Scenarios

Describe how the changes were tested and how reviewers can test them too:

• ✅ Tested manually
• 🤖 Run automated end-to-end tests

✅ Checklist

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• 🔍 PR title is clear and meaningful
• ✍️ PR description clearly explains the changes and their reason
• 📝 I have linked the PR to the corresponding GitHub Issues, if any
• 💬 I have commented my code, especially in hard-to-understand areas
• 📄 I have made corresponding changes to the documentation
• ✅ I have added tests that prove my fix is effective or my feature works

[Copilot]

Pull Request Overview

This PR refactors the ColorPickerDialog component to be exposed from the @geti/ui package instead of being imported from internal file paths. It also adds medium size support to the color picker dialog.

• Moved ColorPickerDialog component to @geti/ui package with proper exports
• Added medium ('M') size support to the color picker dialog
• Updated all import references to use the new package export

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
web_ui/src/shared/components/label-tree-view/label-tree-view-item/label-edition-mode/label-edition-mode.component.tsx	Updated import to use ColorPickerDialog from @geti/ui
web_ui/src/pages/landing-page/landing-page-workspace/components/dataset-import-to-new-project/dataset-import-to-new-project-labels.component.tsx	Updated import to use ColorPickerDialog from @geti/ui
web_ui/src/pages/create-project/components/project-labels-management/utils.ts	Removed validateColor utility function
web_ui/src/pages/create-project/components/project-labels-management/task-labels-management/new-label-tree-item/label-tree-label.component.tsx	Updated import to use ColorPickerDialog from @geti/ui
web_ui/packages/ui/src/color-picker-dialog/utils.ts	Added validateColor utility function to the UI package
web_ui/packages/ui/src/color-picker-dialog/color-picker-dialog.component.tsx	Added medium size support and improved type definitions
web_ui/packages/ui/src/color-picker-dialog/change-color-button.component.tsx	Added medium size support with proper sizing parameters
web_ui/packages/ui/index.ts	Exported ColorPickerDialog component from the UI package

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