[RFE] Remove unused fields

[git-hyagi]

Is your feature request related to a problem? Please describe.
We have some fields that are not being used.
Some examples are:

pulp-operator/api/v1alpha1/repo_manager_types.go

Line 102 in 14b5a7d

StorageType string `json:"storage_type,omitempty"`

pulp-operator/api/v1alpha1/repo_manager_backup_types.go

Line 36 in 14b5a7d

InstanceName string `json:"instance_name"`

Describe the solution you'd like
We could double-check if all the fields defined in CRD are in use and remove the ones that aren't.

Additional context
Before removing the fields we should consider reviewing them in ansible version to get a better understanding of why ansible oeprator had them and if we are missing a feature/functionality.