Scheduler/PivotGrid: align @default tags with option types in public d.ts

[aleksei-semikozov]

No description provided.

[Copilot]

Pull request overview

This PR updates DevExtreme’s public TypeScript declarations for Scheduler and PivotGrid to better align @default tags with the declared option types, and propagates those changes into the aggregated dx.all.d.ts bundle and framework wrappers.

Changes:

• Align multiple Scheduler template/event options to @default undefined and update their types to explicitly include | undefined.
• Update PivotGrid / PivotGridFieldChooser option typings and defaults (including runtime _getDefaultOptions) to use undefined instead of null for several existing options.
• Remove redundant @default undefined tags from many PivotGridDataSourceField (config-item) properties, and adjust a PivotGrid FieldChooser test expectation accordingly.

Reviewed changes

Copilot reviewed 10 out of 15 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
packages/devextreme/ts/dx.all.d.ts	Updates the bundled declaration output to reflect new `
packages/devextreme/testing/tests/DevExpress.ui.widgets.pivotGrid/fieldChooser.tests.js	Adjusts a QUnit assertion to expect undefined instead of null for the default state option.
packages/devextreme/js/ui/scheduler.d.ts	Changes Scheduler option @default tags (notably templates/events) to undefined and updates types accordingly.
packages/devextreme/js/ui/pivot_grid/data_source.d.ts	Aligns fields option typing with @default undefined; removes redundant @default undefined tags from many field config properties.
packages/devextreme/js/ui/pivot_grid.d.ts	Updates PivotGrid event option defaults/types and stateStoring.storageKey to undefined semantics.
packages/devextreme/js/ui/pivot_grid_field_chooser.d.ts	Updates FieldChooser onContextMenuPreparing and state defaults/types to undefined semantics.
packages/devextreme/js/__internal/grids/pivot_grid/m_widget.ts	Changes PivotGrid runtime defaults for several options from null to undefined.
packages/devextreme/js/__internal/grids/pivot_grid/field_chooser/m_field_chooser.ts	Changes FieldChooser runtime default for onContextMenuPreparing from null to undefined.
packages/devextreme/js/__internal/grids/pivot_grid/field_chooser/m_field_chooser_base.ts	Changes FieldChooserBase runtime default for state from null to undefined.
packages/devextreme-react/src/scheduler.ts	Updates narrowed React wrapper event typings to match the updated `
packages/devextreme-react/src/pivot-grid.ts	Updates narrowed React wrapper event typings and storageKey typing to match updated declarations.
packages/devextreme-react/src/pivot-grid-field-chooser.ts	Updates narrowed React wrapper event typing to include `
packages/devextreme-angular/src/ui/pivot-grid/nested/state-storing.ts	Updates Angular wrapper nested option storageKey typing to `string
packages/devextreme-angular/src/ui/pivot-grid/index.ts	Updates Angular wrapper stateStoring typing to allow `storageKey?: string
packages/devextreme-angular/src/ui/pivot-grid-field-chooser/index.ts	Updates Angular wrapper state typing to `any