feat(node): Use diagnostics channel for Fastify v5 error handling #16715
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This will break for > v5!
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This was intentional, just in case Fastify v6 uses a different diagnostics channel hook for errors when published. It won't break if 6.x is used here, in the worst scenario, the error will be captured twice, and deduped eventually.
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I'd rather we check if our tracing:fastify.request.handler:error diagnostics channel listener was registered, that feels like a more robust check.
I guess this is hard because others can also register on tracing:fastify.request.handler:error. Perhaps we can do this by setting a field on the integration? Then you can grab the current client fastify integration instance and check.
Resolves: #15936