Gantt: remove column.ai from dts and docs

[anna-shakhova]

Ref:

• DataGrid - AI Column: implement .d.ts #31166

[Copilot]

Pull request overview

This PR removes the ai property from the Gantt component's column configuration, preventing users from using AI features on Gantt columns. The changes span TypeScript definitions, JSDoc documentation, and all three framework wrappers (Vue, React, Angular).

Changes:

• Modified TypeScript definitions to use Omit<TreeListColumn, 'ai'> to exclude the AI property from Gantt columns
• Added @hidden JSDoc tag to hide dxGanttColumn.ai from documentation
• Removed AI-related components, imports, and configuration from Vue and React wrappers

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/devextreme/ts/dx.all.d.ts	Updated dxGanttColumnBlank to exclude 'ai' property using Omit
packages/devextreme/js/ui/gantt.d.ts	Updated dxGanttColumnBlank interface to extend Omit<TreeListColumn, 'ai'>
packages/devextreme/js/ui/gantt.js	Added JSDoc @hidden tag for dxGanttColumn.ai property
packages/devextreme-vue/src/gantt.ts	Removed AI-related imports, components (DxAI, DxButton, DxEditorOptions, DxOptions), and configuration
packages/devextreme-react/src/gantt.ts	Removed AI-related imports, components (AI, Button, EditorOptions, Options), and type definitions
packages/devextreme-angular/src/ui/gantt/nested/column-dxi.ts	Removed ai property and ColumnAIOptions import, reordered remaining imports
packages/devextreme-angular/src/ui/gantt/index.ts	Removed imports and usage of AI-related modules (DxoGanttAIModule, DxiGanttButtonModule, DxoGanttEditorOptionsModule, DxoGanttOptionsModule)