Switch to linkify-react for element Linkification as it handles React subtrees without exploding (#10060

* Switch to linkify-react instead of our faulty implementation

Fixes a series of soft crashes where errors include "The node to be removed is not a child of this node."

* Improve types

* Fix types

* Update snapshots

* Add test

* Fix test

src/components/views/messages/TextualBody.tsx

@@ -436,7 +436,7 @@ export default class TextualBody extends React.Component<IBodyProps, IState> {
     private onBodyLinkClick = (e: MouseEvent): void => {
         let target = e.target as HTMLLinkElement;
         // links processed by linkifyjs have their own handler so don't handle those here
-        if (target.classList.contains(linkifyOpts.className)) return;
+        if (target.classList.contains(linkifyOpts.className as string)) return;
         if (target.nodeName !== "A") {
             // Jump to parent as the `<a>` may contain children, e.g. an anchor wrapping an inline code section
             target = target.closest<HTMLLinkElement>("a");