test(toast-notification): add unit tests

tests/ToastNotification/ToastNotification.test.svelte

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+<script lang="ts">
+  import { ToastNotification } from "carbon-components-svelte";
+  import type { ComponentProps } from "svelte";
+
+  export let kind: ComponentProps<ToastNotification>["kind"] = "error";
+  export let lowContrast = false;
+  export let timeout = 0;
+  export let role = "alert";
+  export let title = "Error";
+  export let subtitle = "An internal server error occurred.";
+  export let caption = "2024-03-21 12:00:00";
+  export let hideCloseButton = false;
+  export let fullWidth = false;
+  export let statusIconDescription = "";
+  export let closeButtonDescription = "";
+</script>
+
+<ToastNotification
+  {kind}
+  {lowContrast}
+  {timeout}
+  {role}
+  {title}
+  {subtitle}
+  {caption}
+  {hideCloseButton}
+  {fullWidth}
+  {statusIconDescription}
+  {closeButtonDescription}
+  on:close={(e) => {
+    console.log("close", e.detail);
+  }}
+/>