[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/toast/toast-container.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit, ViewChild } from "@angular/core";
+import { Component, OnInit, viewChild } from "@angular/core";
 import { ToastContainerDirective, ToastrService } from "ngx-toastr";
 
 @Component({
@@ -7,12 +7,11 @@ import { ToastContainerDirective, ToastrService } from "ngx-toastr";
   imports: [ToastContainerDirective],
 })
 export class ToastContainerComponent implements OnInit {
-  @ViewChild(ToastContainerDirective, { static: true })
-  toastContainer?: ToastContainerDirective;
+  readonly toastContainer = viewChild(ToastContainerDirective);
 
   constructor(private toastrService: ToastrService) {}
 
   ngOnInit(): void {
-    this.toastrService.overlayContainer = this.toastContainer;
+    this.toastrService.overlayContainer = this.toastContainer();
   }
 }

libs/components/src/toast/toast.service.ts

@@ -1,5 +1,3 @@
-// FIXME: Update this file to be type safe and remove this and next line
-// @ts-strict-ignore
 import { Injectable } from "@angular/core";
 import { IndividualConfig, ToastrService } from "ngx-toastr";
 
@@ -36,7 +34,7 @@ export class ToastService {
           : calculateToastTimeout(options.message),
     };
 
-    this.toastrService.show(null, options.title, toastrConfig);
+    this.toastrService.show(undefined, options.title, toastrConfig);
   }
 
   /**