[PM-15847] libs/components strict migration (#15738)

This PR migrates `libs/components` to use strict TypeScript.

- Remove `@ts-strict-ignore` from each file in `libs/components` and resolved any new compilation errors
- Converted ViewChild and ContentChild decorators to use the new signal-based queries using the [Angular signal queries migration](https://angular.dev/reference/migrations/signal-queries)
  - Made view/content children `required` where appropriate, eliminating the need for additional null checking. This helped simplify the strict migration.

---

Co-authored-by: Vicki League <vleague@bitwarden.com>

libs/components/src/table/table-scroll.component.ts

@@ -1,5 +1,3 @@
-// FIXME: Update this file to be type safe and remove this and next line
-// @ts-strict-ignore
 import {
   CdkVirtualScrollViewport,
   CdkFixedSizeVirtualScroll,
@@ -9,7 +7,6 @@ import { CommonModule } from "@angular/common";
 import {
   AfterContentChecked,
   Component,
-  ContentChild,
   OnDestroy,
   TemplateRef,
   Directive,
@@ -18,6 +15,7 @@ import {
   ElementRef,
   TrackByFunction,
   input,
+  contentChild,
 } from "@angular/core";
 
 import { ScrollLayoutDirective } from "../layout";
@@ -69,7 +67,7 @@ export class TableScrollComponent
   /** Optional trackBy function. */
   readonly trackBy = input<TrackByFunction<any> | undefined>();
 
-  @ContentChild(BitRowDef) protected rowDef: BitRowDef;
+  protected readonly rowDef = contentChild(BitRowDef);
 
   /**
    * Height of the thead element (in pixels).
@@ -81,7 +79,7 @@ export class TableScrollComponent
   /**
    * Observer for table header, applies padding on resize.
    */
-  private headerObserver: ResizeObserver;
+  private headerObserver?: ResizeObserver;
 
   constructor(
     private zone: NgZone,