beforeHandler to preHandler

[royalcala]

(node:8379) Warning: The route option beforeHandler has been deprecated, use preHandler instead

[apollo-cla]

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[markrzen]

Duplicate of #2391

[abernix]

As I posted in the other duplicates:

Closing as duplicate of #3527 and #2391. It is absolutely on my mind to get the major version bumped in the next major version of Apollo Server. I understand the disappointing delay, in particular on the Fastify updates, but opening more of these same/similar PRs won't get the blockers unblocked for that work. We are trying to get to a stage where this is less problematic both now, and in the future. (See also, #3184 and #3576)