Add Sentry Monitoring (and break API routes)

[james-wallis]

Adds Sentry

• Sentry didn't work without adding: useServerlessTraceTarget - same issue in the Launcher
• As a result of either adding Sentry or useServerlessTraceTarget Next.js API routes now return a 503 and are broken
• There are a few Sentry related issues open on serverless-nextjs. 503 error on invoking an API endpoint serverless-nextjs/serverless-next.js#1776 has a comment at the bottom showing that Sentry doesn't work with the serverless target
• Given that we likely won't need to use API routes, I've opted to add Sentry but we can reevaluate in the future if our requirements change

From Sentry docs:

@sentry/nextjs does not support configurations with the serverless target. To use the SDK in serverless environments, switch to using the experimental-serverless-trace target, which is recommended by the Next.js maintainers for apps using Next.js 10 or Next.js 11.
https://docs.sentry.io/platforms/javascript/guides/nextjs/manual-setup/

• Feature

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