[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/callout/callout.component.html

@@ -1,6 +1,6 @@
 <aside
   class="tw-mb-4 tw-box-border tw-rounded-lg tw-bg-background tw-ps-3 tw-pe-3 tw-py-2 tw-leading-5 tw-text-main"
-  [ngClass]="calloutClass"
+  [ngClass]="calloutClass()"
   [attr.aria-labelledby]="titleId"
 >
   @if (titleComputed(); as title) {