fix(pivotGrid): Fix error thrown opening date pivot dimension filter.

[skrustev]

#17478

Type of Change (check all that apply):

• Bug fix
• New functionality
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (no functional changes)
• Documentation
• Demos
• CI/CD
• Tests
• Changelog
• Skills/Agents

Component(s) / Area(s) Affected:

Pivot Grid

How Has This Been Tested?

• Unit tests
• Manual testing
• Automated e2e tests

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code (test guidelines)
• This PR includes API docs for newly added methods/properties (api docs guidelines)
• This PR includes feature/README.MD updates for the feature docs
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes ng update migrations for the breaking changes (migrations guidelines)
• This PR includes behavioral changes and the feature specification has been updated with them
• Accessibility (ARIA, keyboard navigation, focus management) has been verified

[Copilot]

Pull request overview

Fixes a runtime error in the Pivot Grid that occurs when opening a Date pivot dimension filter by deferring column regeneration triggered by i18n resource changes.

Changes:

• Defer setupColumns() execution inside the i18n onResourceChange handler via a microtask (Promise.resolve().then(...)).

Suppressed comments (1)

projects/igniteui-angular/grids/pivot-grid/src/pivot-grid.component.ts:1003

• The deferred setupColumns() call is scheduled via a Promise microtask, which is not cancelled by destroy$. If an onResourceChange event fires shortly before the grid is destroyed, this microtask can still run after ngOnDestroy, potentially invoking setupColumns() on a destroyed instance.

                Promise.resolve().then(() => {
                    this.setupColumns();
                });