Resolve build warnings for unused component imports and SCSS deprecations

[dobromirts]

The build and CI process currently produces multiple warnings that should be addressed

1. NG8113 — Several components declare imports that are not used in their templates:

• CategoriesFilterPipe and FilterByName in MaterialIconsExtendedComponent

• IgxGridLiteColumnComponent in GridLiteDataBindingDynamicComponent

• IgxGridLiteCellTemplateDirective in GridLiteFilteringEventsComponent

2. SCSS deprecations — 56+ repetitive deprecation warnings). These likely originate from deprecated SCSS APIs in the theming layer.