Add default datastore name in the helm chart

[bsctl]

close #535

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[bsctl]

@prometherion always have issues on helm-docs. I always run helm-docs before to push but CI still complains about it:

 | Key | Type | Default | Description |
 |-----|------|---------|-------------|
 | affinity | object | `{}` | Kubernetes affinity rules to apply to Kamaji controller pods |
-| defaultDatastoreName | string | `"default"` | Specify the default DataStore name for the Kamaji instance. |
+| defaultDatastoreName | string | `"default"` | (string) Specify the default DataStore name for the Kamaji instance. |

Just noted the CI uses helm-docs 1.8 while on my machine there is the 1.11

helm-docs --version
helm-docs version 1.11.0