http: return this from ClientRequest#destroy()

This commit updates ClientRequest#destroy() to return `this`
for consistency with other writable streams.

PR-URL: https://github.com/nodejs/node/pull/32789


Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>