So far we manually hardcoded $LISTEN_FDNAMES to "varlink" in various varlink service units we ship, even though FileDescriptorName=varlink is specified in associated socket units already, because FileDescriptorName= is currently silently ignored when combined with Accept=yes. Let's step away from this, which seems saner. Note that this is technically a compat break, but a mostly negligible one as there shall be few users setting FileDescriptorName= but still expecting LISTEN_FDNAMES=connection in the actual executable. Preparation for #34080
System and Service Manager
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