schema: Specify config properties for capi, hnc, storage

This adds:
- common reusable things under $defs
- clusterApi
- harbor
- hnc
- objectStorage
- rookCeph
- storageClasses
- user
- velero

Common objects defined by the Kubernetes project are either prefixed
with 'kubernetes' when authored by us, using an 'io.k8s' prefix when
imported directly from the Kubernetes API definitions.

They can be found in the file kubernetes/spec/api/openapi-spec/v3/api__v1_openapi.json

The following script was used to find all referenced objects that were needed.

```bash
set -euxo pipefail

yq4 -i -P 'del(.$defs.kubernetesAffinity)' config/schemas/config.yaml
c="io.k8s.api.core.v1.Affinity" yq4 -i -P '.$defs[env(c)] = load(".../kubernetes/api/openapi-spec/v3/api__v1_openapi.json").components.schemas[env(c)]' config/schemas/config.yaml
c="io.k8s.apimachinery.pkg.apis.meta.v1.LabelSelectorRequirement" yq4 -i -P '.$defs[env(c)] = load(".../kubernetes/api/openapi-spec/v3/api__v1_openapi.json").components.schemas[env(c)]' config/schemas/config.yaml

while grep -qF '#/components/schemas/' config/schemas/config.yaml; do
	for component in $(grep -oP "#/components/schemas/[^'\"]*" config/schemas/config.yaml | cut -d/ -f4); do
    c="${component}" yq4 -i -P '.$defs[env(c)] = load(".../kubernetes/api/openapi-spec/v3/api__v1_openapi.json").components.schemas[env(c)]' config/schemas/config.yaml
    sed -i "s|#/components/schemas/${component}|#/\$defs/${component}|" config/schemas/config.yaml
  done
done
```

Co-authored-by: André Arnqvist <58822152+aarnq@users.noreply.github.com>
Co-authored-by: Fredrik Liv <fredrik.liv@elastisys.com>

Author: 3 people

config/schemas/README.md

@@ -85,6 +85,18 @@ EOF
 
 The output can be tweaked and inserted into `config/schemas/config.yaml` under `.properties`.
 
+To limit duplication, common properties that are used in many places can be placed under `.$defs` and referenced via `$ref: '#/$defs/thing'`
+
+```yaml
+$defs:
+  common:
+    title: Some Common Thing
+service:
+  title: The Service
+  common:
+    $ref: '#/$defs/common'
+```
+
 ## VSCode
 
 The plugin `redhat.vscode-yaml` can provide auto completion, validation and help texts from the schema.