Fix markdown security and enable most CSS (#5263)

* Fix markdown security and enable most CSS

Stops using our sanitizer and instead disables HTML in markdown engine
- This was blocking Note because it converted > to >
- It's slightly more strict in that it fully disables HTML unless trusted. Will need to improve handling of Trusted to support this in a future PR

Adds in correct CSS, both from .css file in markdown extension and from built-into all webviews global CSS
- Fix #3765 standard markdown support
- Fix Support of Notes by bringing correct styles
- Fix code block colorization
- Fix link handling so it's not bolded / gets underlined on hover
- Fixes table rendering (for markdown and HTML tables)

* Reduce scope of CSS changes
- Removed some CSS that wasn't needed or caused issues
- Scoped most things under the preview section not the whole component

* Avoid markdown html block by sanitizing after render

* Fix pre node not overflowing
- This was a bug in existing implementation too

build/gulpfile.hygiene.js

@@ -134,7 +134,7 @@ const copyrightFilter = [
 	'!src/sql/workbench/parts/notebook/outputs/common/renderMimeInterfaces.ts',
 	'!src/sql/workbench/parts/notebook/outputs/common/outputProcessor.ts',
 	'!src/sql/workbench/parts/notebook/outputs/common/mimemodel.ts',
-	'!src/sql/workbench/parts/notebook/cellViews/media/output.css',
+	'!src/sql/workbench/parts/notebook/cellViews/media/*.css',
 	'!src/sql/base/browser/ui/table/plugins/rowSelectionModel.plugin.ts',
 	'!src/sql/base/browser/ui/table/plugins/rowDetailView.ts',
 	'!src/sql/base/browser/ui/table/plugins/headerFilter.plugin.ts',