Provide more installation samples

[git-hyagi]

In the past, with pulp_installer, we had playbooks to do a “complete” installation of Pulp and its components.
We should update our CR samples with more combinations of installations, like:

• install Pulp with signing metadata (with {file,object} storage and bellow combinations)
• some variations of ingress types (ingress, route, node_port)
• combinations of external DB and/or cache
• update the current samples with the deprecated pulp_settings field to use custom_pulp_settings
• etc.

this would be helpful to avoid having to first install Pulp and then having to modify/tweak the CR to enable the feature A or change the unwanted behavior B.

Additional context
Update our docs explaining the usage of these samples.