Tweak context summary format #6401

Job	Run time
build-and-check	3m 18s
test-integration-packages/billing	1m 22s
test-integration-sdk	1m 37s
test-integration-packages/internal	1m 17s
test-integration-cli	54s
test-integration-web	54s
test-integration-common	49s
test-integration-packages/agent-runtime	58s
test-packages/internal	1m 6s
test-web	1m 17s
test-common	59s
test-cli	1m 6s
test-.agents	59s
test-packages/billing	49s
test-packages/agent-runtime	50s
test-sdk	54s
	19m 9s

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