chore: Refactor Postgres TLS certificate file handling #471

Job	Run time
helm	10s
integration (default, v1.25.0)	2m 54s
integration (default, v1.29.0)	2m 56s
integration (default, v1.31.0)	3m 2s
integration (ldap, v1.25.0)	2m 51s
integration (ldap, v1.29.0)	2m 48s
integration (ldap, v1.31.0)	3m 20s
integration (ingress, v1.25.0)	3m 10s
integration (ingress, v1.29.0)	2m 31s
integration (ingress, v1.31.0)	2m 16s
integration (volume, v1.25.0)	2m 57s
integration (volume, v1.29.0)	2m 25s
integration (volume, v1.31.0)	2m 28s
integration (pubsub, v1.25.0)	3m 18s
integration (pubsub, v1.29.0)	2m 17s
integration (pubsub, v1.31.0)	2m 51s
integration (nats, v1.25.0)	2m 51s
integration (nats, v1.29.0)	3m 35s
integration (nats, v1.31.0)	3m 7s
integration (oidc, v1.25.0)	3m 37s
integration (oidc, v1.29.0)	3m 35s
integration (oidc, v1.31.0)	3m 0s
integration (postgres, v1.25.0)	3m 16s
integration (postgres, v1.29.0)	3m 8s
integration (postgres, v1.31.0)	3m 6s
integration (postgres-tls-manual, v1.25.0)	3m 14s
integration (postgres-tls-manual, v1.29.0)	2m 13s
integration (postgres-tls-manual, v1.31.0)	2m 13s
	1h 19m 9s

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