test(@angular/ssr): mark jasmine tests as flaky #1303

Job	Run time
list	27s
workflow (modules-builder-tests)	1m 59s
workflow (devkit-core-tests-rerun)	1m 28s
workflow (build-unit-tests)	2m 20s
workflow (devkit-core-tests)	1m 37s
workflow (build-cli)	1m 44s
	9m 35s

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