@W-17907321 Fix server-timing header delimiter #8277

Job	Run time
changelog-check	20s
lighthouse (22)	14m 8s
generated-windows (retail-react-app-test-project)	8m 37s
pwa-kit (18, 8)	8m 32s
generated (retail-react-app-test-project)	4m 54s
generated-windows (retail-react-app-demo)	7m 44s
pwa-kit (18, 9)	8m 33s
generated (retail-react-app-demo)	5m 5s
generated-windows (express-minimal-test-project)	5m 20s
pwa-kit (18, 10)	9m 47s
generated (express-minimal-test-project)	3m 32s
generated-windows (typescript-minimal-test-project)	6m 2s
pwa-kit (20, 8)	7m 41s
generated (typescript-minimal-test-project)	3m 25s
pwa-kit-windows (18, 8)	10m 45s
pwa-kit (20, 9)	7m 47s
pwa-kit-windows (18, 9)	11m 19s
pwa-kit (20, 10)	8m 45s
pwa-kit-windows (18, 10)	10m 0s
pwa-kit (20, 11)	7m 43s
pwa-kit-windows (20, 8)	10m 33s
pwa-kit (22, 8)	11m 3s
pwa-kit-windows (20, 9)	11m 15s
pwa-kit (22, 9)	10m 55s
pwa-kit (22, 10)	8m 5s
pwa-kit-windows (20, 10)	10m 25s
pwa-kit-windows (20, 11)	9m 47s
pwa-kit (22, 11)	10m 59s
pwa-kit-windows (22, 8)	15m 56s
pwa-kit-windows (22, 9)	15m 16s
pwa-kit-windows (22, 10)	15m 33s
pwa-kit-windows (22, 11)	21m 35s
	5h 1m 21s

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