Remove support for mariner.2.0 host rid

Author: NikolaMilosavljevic

src/Installer/redist-installer/targets/GenerateLayout.targets

@@ -34,7 +34,6 @@
 
       <NetRuntimeRid Condition="'$(NetRuntimeRid)' == ''">$(HostRid)</NetRuntimeRid>
       <NetRuntimeRid Condition=" ('$(OSName)' == 'win' or '$(OSName)' == 'osx' or '$(OSName)' == 'freebsd') and '$(DotNetBuildSourceOnly)' != 'true' ">$(OSName)-$(Architecture)</NetRuntimeRid>
-      <NetRuntimeRid Condition="'$(DotNetBuild)' != 'true' and $(NetRuntimeRid.StartsWith('mariner.2.0'))">$(HostRid.Replace('mariner.2.0', 'cm.2'))</NetRuntimeRid>
       <NetRuntimeRid Condition="'$(DotNetBuild)' != 'true' and $(NetRuntimeRid.StartsWith('azurelinux.3.0'))">$(HostRid.Replace('azurelinux.3.0', 'azl.3'))</NetRuntimeRid>
 
       <!-- only the runtime OSX .pkgs have a `-internal` suffix -->