176990 Implement get presubmit guard summaries api #725

Job	Run time
collect_tests	4s
test-common-packages (cipd_packages/codesign)	1m 15s
test-common-packages (packages/cocoon_integration_test)	1m 25s
test-common-packages (packages/cocoon_common_test)	1m 19s
test-common-packages (packages/cocoon_server)	1m 22s
test-common-packages (dev/cocoon_code_health)	1m 21s
test-common-packages (licenses)	1m 14s
test-common-packages (auto_submit)	1m 52s
test-common-packages (packages/buildbucket-dart)	1m 26s
test-common-packages (dev/githubanalysis)	1m 14s
test-common-packages (packages/cocoon_server_test)	1m 23s
test-common-packages (cipd_packages/device_doctor)	1m 40s
test-common-packages (packages/cocoon_common)	1m 28s
	17m 3s

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