Fix flakey XCTest parallel test failure reporting #551

Job	Run time
Test / Linux (5.8 - jammy)	4m 16s
Test / Windows (5.9 - windows-2022)	10m 52s
Test / Linux (5.9 - jammy)	3m 54s
Test / Windows (6.0 - windows-2022)	12m 6s
Test / Linux (5.10 - jammy)	4m 8s
Test / Windows (nightly-6.1 - windows-2022)	14m 17s
Test / Linux (6.0 - jammy)	5m 12s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	5s
Soundness / Unacceptable language check	5s
Soundness / Documentation check	0s
Soundness / License headers check	0s
Soundness / Shell check	37s
Soundness / YAML lint check	5s
Soundness / Format check	0s
Soundness / Python lint check	4s
	55m 41s

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