Refactor-v-html-markdown.vue

What does this MR do and why?

Replaces dangerous v-html with our safe directive v-safe-html
Closes - #241888 (closed) Remove v-html from app/assets/javascripts/notebook/cells/markdown.vue

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app/assets/javascripts/notebook/cells/markdown.vue

 <script>
 import katex from 'katex';
 import marked from 'marked';
-import { GlSafeHTMLDirective as SafeHtml } from '@gitlab/ui';
+import { GlSafeHtmlDirective as SafeHtml } from '@gitlab/ui';
 import { sanitize } from '~/lib/dompurify';
 import { hasContent, markdownConfig } from '~/lib/utils/text_utility';
 import Prompt from './prompt.vue';