Tests

Load external references v4 take2 #909

Job	Run time
osx	5m 2s
linux (swift:5.8-bionic)	3m 1s
linux (swift:5.8-focal)	3m 1s
linux (swift:5.8-jammy)	3m 1s
linux (swift:5.8-amazonlinux2)	3m 3s
linux (swift:5.9-focal)	3m 18s
linux (swift:5.9-jammy)	3m 15s
linux (swift:5.9-amazonlinux2)	3m 21s
linux (swift:5.10-focal)	3m 17s
linux (swift:5.10-jammy)	3m 19s
linux (swift:5.10-amazonlinux2)	3m 19s
linux (swiftlang/swift:nightly-bionic)	3m 47s
linux (swiftlang/swift:nightly-focal)	3m 51s
linux (swiftlang/swift:nightly-jammy)	3m 48s
linux (swiftlang/swift:nightly-amazonlinux2)	4m 16s
	52m 39s

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