Patroni Version check does not respect default images defined in env variables

[Kajot-dev]

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Operator allows to specify default images via RELATED_IMAGE_POSTGRES_* env variables, to not require users to define spec.image by themselves.

When creating a new cluster operator tries to do Patroni version check which fails because cluster defined by the user uses default image instead :/

More about the problem

Expected behaviour is that if spec.image is not defined it will try to use the default image if specified like all other components.

Instead creating/doing anything to the cluster fails

Steps to reproduce

1. Configure operator with default images
2. Try to create a cluster which utilizes default image (no spec.image)
3. Creating/managing cluster fails

Versions

1. Kubernetes 1.24 (present on all versions)
2. Operator 2.6.0+ (since patroni check was introduced)
3. Database 15 (present on all versions)

Anything else?

No response