fix(grids): use forwardRef for validator directives

[ddaribo]

Closes #3994

[Copilot]

Pull request overview

Fixes the Angular compilation error in the grid/tree-grid/hierarchical-grid “validator service extended” samples caused by referencing the validator directive class in the @Directive providers metadata before the class declaration (Issue #3994). This aligns the samples with Angular’s recommended pattern by deferring the class reference via forwardRef.

Changes:

• Import forwardRef from @angular/core in the affected sample components.
• Update NG_VALIDATORS provider registrations to use useExisting: forwardRef(() => <DirectiveClass>) in all three samples.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/app/grid/grid-validator-service-extended/grid-validator-service-extended.component.ts	Wraps the PhoneFormatDirective validator provider with forwardRef to avoid “used before declaration” compilation failure.
src/app/hierarchical-grid/hierarchical-grid-validator-service-extended/hierarchical-grid-validator-service-extended.component.ts	Uses forwardRef for HGridPhoneFormatDirective in NG_VALIDATORS provider to fix compilation.
src/app/tree-grid/tree-grid-validator-service-extended/tree-grid-validator-service-extended.component.ts	Uses forwardRef for TGridPhoneFormatDirective in NG_VALIDATORS provider to fix compilation.

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