[tests] Added mock db for easier testing #5225

Job	Run time
build-and-check	2m 37s
test-integration-packages/agent-runtime	45s
test-integration-web	43s
test-integration-common	39s
test-integration-.agents	1m 13s
test-integration-packages/billing	40s
test-.agents	45s
test-integration-sdk	52s
test-cli	1m 11s
test-integration-cli	48s
test-packages/billing	42s
test-common	40s
test-packages/agent-runtime	58s
test-web	50s
test-sdk	50s
test-packages/internal	48s
test-integration-packages/internal	40s
	15m 41s

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