Use dummy cache when `AUTH_ENABLED` env var is set to true #9295

Job	Run time
Build	8s
Migration tests	31s
Dependency checks	36s
Integration tests	1m 7s
Architecture checks	10s
Linting	16s
System tests	48s
Test coverage	2m 44s
Unit tests	26s
Vulnerability checks	12s
Publish ingestion image to central ECR	0s
Publish main image to central ECR	0s
Trigger deployments	0s
	6m 58s

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