[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/item/item-content.component.ts

@@ -1,6 +1,3 @@
-// FIXME: Update this file to be type safe and remove this and next line
-// @ts-strict-ignore
-
 import { NgClass } from "@angular/common";
 import {
   AfterContentChecked,
@@ -8,8 +5,8 @@ import {
   Component,
   ElementRef,
   signal,
-  ViewChild,
   input,
+  viewChild,
 } from "@angular/core";
 
 import { TypographyModule } from "../typography";
@@ -30,7 +27,7 @@ import { TypographyModule } from "../typography";
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class ItemContentComponent implements AfterContentChecked {
-  @ViewChild("endSlot") endSlot: ElementRef<HTMLDivElement>;
+  readonly endSlot = viewChild<ElementRef<HTMLDivElement>>("endSlot");
 
   protected endSlotHasChildren = signal(false);
 
@@ -42,6 +39,6 @@ export class ItemContentComponent implements AfterContentChecked {
   readonly truncate = input(true);
 
   ngAfterContentChecked(): void {
-    this.endSlotHasChildren.set(this.endSlot?.nativeElement.childElementCount > 0);
+    this.endSlotHasChildren.set((this.endSlot()?.nativeElement.childElementCount ?? 0) > 0);
   }
 }