test: add deprecation code to expectWarning

This commit adds a deprecation code to expectWarning and updates the
function to check the passed code against the code property on the
warning object.

Not all warnings have a deprecation code so for those that don't an
explicit code of common.noWarnCode is required. Passing this skips the
assertion of the code.

PR-URL: https://github.com/nodejs/node/pull/19474


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>