[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/shared/button-like.abstraction.ts

@@ -1,12 +1,10 @@
-// FIXME: Update this file to be type safe and remove this and next line
 import { ModelSignal } from "@angular/core";
 
-// @ts-strict-ignore
 export type ButtonType = "primary" | "secondary" | "danger" | "unstyled";
 
 export type ButtonSize = "default" | "small";
 
 export abstract class ButtonLikeAbstraction {
-  loading: ModelSignal<boolean>;
-  disabled: ModelSignal<boolean>;
+  abstract loading: ModelSignal<boolean>;
+  abstract disabled: ModelSignal<boolean>;
 }

libs/components/src/shared/compact-mode.service.ts

@@ -1,5 +1,3 @@
-// FIXME: Update this file to be type safe and remove this and next line
-// @ts-strict-ignore
 import { Observable } from "rxjs";
 
 /** Global config for the Bitwarden Design System */
@@ -9,5 +7,5 @@ export abstract class CompactModeService {
    *
    * Component authors can also hook into compact mode with the `bit-compact:` Tailwind variant.
    **/
-  enabled$: Observable<boolean>;
+  abstract enabled$: Observable<boolean>;
 }

libs/components/src/shared/focusable-element.ts

@@ -1,10 +1,8 @@
-// FIXME: Update this file to be type safe and remove this and next line
-// @ts-strict-ignore
 /**
  * Interface for implementing focusable components.
  *
  * Used by the `AutofocusDirective`.
  */
 export abstract class FocusableElement {
-  getFocusTarget: () => HTMLElement | undefined;
+  abstract getFocusTarget(): HTMLElement | undefined;
 }