Host configuration with property expansion doesn't work with prefixes/postfixes

We support property expansion in virtual host configuration, see https://xmdocumentation.bloomreach.com/library/enterprise/installation-and-configuration/configure-virtual-hosts-in-an-environment.html

When property expansion is combined with prefixes or postfixes in the node name, this works on the delivery part, but not when saving channel properties in the Experience Manager.

Example

• System property ${brc.environmentname}=dev
• Host configuration: /hst:hst/hst:hosts/dev/cloud/bloomreach/example/www-${brc.environmentname}
• Delivery at www-dev.example.bloomreach.cloud works

Saving channel properties in the Experience Manager leads to

[org.hippoecm.hst.pagecomposer.jaxrs.services.RootResource.saveChannel():204] Failed to saveChannel channel
org.hippoecm.hst.configuration.channel.ChannelException: Mount not found: /hst:hst/hst:hosts/dev/cloud/bloomreach/example/www-dev/hst:root
	at org.hippoecm.hst.platform.configuration.channel.ChannelManagerImpl.mountNotFoundException(ChannelManagerImpl.java:694) ~[hst-platform-15.1.0.jar:15.1.0]
	at org.hippoecm.hst.platform.configuration.channel.ChannelManagerImpl.updateChannel(ChannelManagerImpl.java:631) ~[hst-platform-15.1.0.jar:15.1.0]

Analysis
Method org.hippoecm.hst.platform.configuration.channel.ChannelManagerImpl#findSubstitutedNodeNames only supports matching on full node names.