[tests] Added mock db for easier testing #5219

Job	Run time
build-and-check	2m 47s
test-cli	1m 10s
test-packages/agent-runtime	54s
test-packages/internal	40s
test-web	51s
test-integration-packages/billing	48s
test-common	40s
test-integration-common	43s
test-packages/billing	49s
test-.agents	44s
test-integration-cli	48s
test-integration-web	46s
test-integration-packages/internal	43s
test-integration-sdk	53s
test-integration-packages/agent-runtime	40s
test-integration-.agents	1m 10s
test-sdk	54s
	16m 0s

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