Tests

Port of `ExternallyDereferenceable` to `OpenAPIKit30` module #922

Job	Run time
osx	2m 9s
linux (swift:5.8-bionic)	1m 22s
linux (swift:5.8-focal)	1m 20s
linux (swift:5.8-jammy)	1m 26s
linux (swift:5.8-amazonlinux2)	1m 25s
linux (swift:5.9-focal)	1m 38s
linux (swift:5.9-jammy)	1m 33s
linux (swift:5.9-amazonlinux2)	1m 36s
linux (swift:5.10-focal)	1m 37s
linux (swift:5.10-jammy)	1m 26s
linux (swift:5.10-amazonlinux2)	1m 32s
linux (swiftlang/swift:nightly-bionic)	2m 2s
linux (swiftlang/swift:nightly-focal)	2m 11s
linux (swiftlang/swift:nightly-jammy)	2m 3s
linux (swiftlang/swift:nightly-amazonlinux2)	2m 19s
	25m 39s

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