ffa22212560c9e7a8692cb8982d9b3b507ee9af1 tests: Pass fuzzing inputs as constant references (practicalswift)
Pull request description:
Pass fuzzing inputs as constant references. Split out from #17009 as suggested by MarcoFalke in https://github.com/bitcoin/bitcoin/pull/17009#discussion_r331502028.
Backport of Core PR17069