Update Helm Chart

[mprechtl]

Helm chart must be updated, especially after the update to eIDAS-Node 2.7. We should also update the helm chart that all property keys can be set as values. Those values will then be set as entries in the specific property files.

For example (values.yaml):

connector:
  metadata:
    url: https://eidas-node/eidas-node/metadata

becomes in the XML (eidas.xml) the following:

<entry key="connector.metadata.url">https://eidas-node/eidas-node/metadata</entry>