jest: small configuration changes for mock #1022

Job	Run time
prepare-itg	18s
test	1m 47s
test-itg (github.test.itg.ts, ubuntu-latest)	44s
test-itg (github.test.itg.ts, macos-13)	1m 15s
test-itg (github.test.itg.ts, macos-12)	1m 40s
test-itg (github.test.itg.ts, windows-latest)	58s
test-itg (buildx/history.test.itg.ts, ubuntu-latest)	54s
test-itg (buildx/history.test.itg.ts, macos-13)	50s
test-itg (buildx/history.test.itg.ts, macos-12)	47s
test-itg (buildx/history.test.itg.ts, windows-latest)	59s
test-itg (docker/install.test.itg.ts, ubuntu-latest)	1m 0s
test-itg (docker/install.test.itg.ts, macos-13)	6m 23s
test-itg (docker/install.test.itg.ts, macos-12)	7m 59s
test-itg (docker/install.test.itg.ts, windows-latest)	2m 21s
test-itg (buildx/bake.test.itg.ts, ubuntu-latest)	42s
test-itg (buildx/bake.test.itg.ts, macos-13)	48s
test-itg (buildx/bake.test.itg.ts, macos-12)	48s
test-itg (buildx/bake.test.itg.ts, windows-latest)	59s
test-itg (docker/docker.test.itg.ts, ubuntu-latest)	48s
test-itg (docker/docker.test.itg.ts, macos-13)	52s
test-itg (docker/docker.test.itg.ts, macos-12)	1m 12s
test-itg (docker/docker.test.itg.ts, windows-latest)	1m 0s
test-itg (buildx/install.test.itg.ts, ubuntu-latest)	51s
test-itg (buildx/install.test.itg.ts, macos-13)	1m 9s
test-itg (buildx/install.test.itg.ts, macos-12)	1m 7s
test-itg (buildx/install.test.itg.ts, windows-latest)	1m 2s
test-itg (cache.test.itg.ts, ubuntu-latest)	42s
test-itg (cache.test.itg.ts, macos-13)	1m 6s
test-itg (cache.test.itg.ts, macos-12)	51s
test-itg (cache.test.itg.ts, windows-latest)	1m 15s
	43m 7s

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