More comprehensive prompt cache debugging logs #5860

Job	Run time
build-and-check	2m 52s
test-integration-sdk	1m 18s
test-integration-packages/internal	1m 4s
test-integration-common	40s
test-integration-packages/billing	1m 3s
test-integration-web	47s
test-integration-packages/agent-runtime	47s
test-packages/internal	49s
test-.agents	45s
test-packages/billing	47s
test-web	47s
test-cli	53s
test-sdk	45s
test-integration-cli	42s
test-packages/agent-runtime	46s
test-common	44s
	15m 29s

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