Revert "Sign Mariner rpms with Mariner cert (#61262)"

This reverts commit 3f3d8d9.

Author: ViktorHofer

eng/Signing.props

@@ -15,10 +15,6 @@
     <FileSignInfo Include="Mono.Cecil.Mdb.dll" CertificateName="3PartySHA2" />
     <FileSignInfo Include="Mono.Cecil.Pdb.dll" CertificateName="3PartySHA2" />
     <FileSignInfo Include="Mono.Cecil.Rocks.dll" CertificateName="3PartySHA2" />
-    
-    <!-- Ensure that azl files get the mariner cert -->
-    <AzureLinuxRPM Include="$(ArtifactsPackagesDir)**/*-azl-*.rpm" />
-    <FileSignInfo Include="@(AzureLinuxRPM->'%(Filename)%(Extension)')" CertificateName="LinuxSignMariner" />
   </ItemGroup>
 
   <PropertyGroup>