[Infra] Add check for unexpected test failures in build.sh #5022

Job	Run time
spm-package-resolved	1m 46s
spm-package-resolved	1m 46s
swift-build-run (macos-15, Xcode_16, spm)	12m 48s
swift-build-run (macos-15, Xcode_16, spm)	12m 48s
swift-build-run (macos-14, Xcode_15.3, spm)	1h 22m 43s
swift-build-run (macos-14, Xcode_15.3, spm)	1h 0m 57s
iOS-Device (macos-14, Xcode_15.3)	4m 43s
iOS-Device (macos-14, Xcode_15.3)	4m 43s
iOS-Device (macos-15, Xcode_16)	3m 9s
iOS-Device (macos-15, Xcode_16)	3m 9s
platforms (tvOS)	11m 16s
platforms (tvOS)	11m 16s
platforms (macOS)	6m 12s
platforms (macOS)	6m 12s
platforms (catalyst)	10m 27s
platforms (catalyst)	10m 27s
	4h 4m 22s

Provide feedback