Add RepeatUntil extension on test instruction #368

Job	Run time
inspectcode	3m 19s
test-netstandard	2m 24s
test-unity (2021.3.27f1)	3m 44s
test-unity (2022.3.2f1)	4m 28s
test-mutation-core / stryker	4m 32s
test-mutation-gherkin / stryker	3m 54s
	22m 21s

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