CI: Remove parallel-fuzzing hack #435

Job	Run time
build-musl (6.0.1-jammy, https://download.swift.org/swift-6.0.1-release/static-sdk/swift-6.0.1-RE...	2m 2s
build-macos (Xcode_14.3.1)	5m 31s
build-linux (swift:5.8-focal)	4m 46s
build-macos (Xcode_15.0.1)	14m 3s
build-xcode	2m 32s
build-linux (swift:5.9-focal)	4m 55s
build-linux (swift:5.9-amazonlinux2)	3m 37s
build-linux (swift:6.0-focal)	5m 22s
build-cmake	45s
build-linux (swiftlang/swift:nightly-main-jammy)	5m 24s
build-windows	4m 1s
deploy-dev-dashboard	6s
	53m 4s

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