Fix helpful.js memory leak

[snehankekre]

Browsing many (15-30+) pages in succession on the same browser tab causes the tab to slow down and eventually crash due to a memory leak in the helpful.js component.

That component is called every time one changes the page. Over time, it stacks so many function calls that it breaks the site. The solution is to perform the route change cleanup function for the Helpful component inside a useEffect call instead of using router.events.on("routeChangeComplete", handleRouteChange).

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