Adopt strict concurrency checking #845

Job	Run time
License Header and Formatting Checks	2m 58s
Integration Tests on swiftlang/swift:nightly-focal	3m 25s
Integration Tests on swift:5.8-jammy	2m 48s
Integration Tests on swift:5.7-jammy	2m 45s
Integration Tests on swift:5.6-focal	2m 29s
Build and Test on swiftlang/swift:nightly-focal	4m 48s
Build and Test on swift:5.8-jammy	3m 46s
Build and Test on swift:5.7-jammy	2m 58s
Build and Test on swift:5.6-focal	3m 32s
Performance Tests on swiftlang/swift:nightly-focal	10m 28s
Performance Tests on swift:5.8-jammy	9m 8s
Performance Tests on swift:5.7-jammy	10m 17s
Performance Tests on swift:5.6-focal	9m 9s
	1h 8m 31s

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