[tests] Added mock db for easier testing #5217

Job	Run time
build-and-check	2m 48s
test-packages/agent-runtime	51s
test-packages/internal	48s
test-integration-packages/agent-runtime	40s
test-integration-cli	47s
test-sdk	55s
test-packages/billing	41s
test-integration-sdk	58s
test-integration-packages/internal	47s
test-integration-common	46s
test-integration-web	56s
test-common	40s
test-cli	1m 12s
test-web	50s
test-integration-.agents	1m 16s
test-integration-packages/billing	42s
test-.agents	44s
	16m 21s

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