[tests] Added mock db for easier testing #5227

Job	Run time
build-and-check	2m 44s
test-integration-.agents	1m 22s
test-integration-packages/internal	40s
test-integration-web	48s
test-integration-packages/agent-runtime	40s
test-integration-sdk	54s
test-cli	1m 57s
test-sdk	59s
test-.agents	41s
test-integration-common	59s
test-integration-cli	41s
test-integration-packages/billing	39s
test-packages/agent-runtime	58s
test-web	41s
test-common	49s
test-packages/billing	43s
test-packages/internal	46s
	17m 1s

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