Add Azure.Core dependency (Azure#50673)

Author: JonathanCrd

sdk/keyvault/samples/sharelink/ShareLink.csproj

@@ -20,6 +20,7 @@
     <PackageReference Include="Azure.Identity" />
     <PackageReference Include="Azure.Security.KeyVault.Secrets" />
     <PackageReference Include="System.CommandLine" VersionOverride="2.0.0-beta1.21216.1" />
+    <PackageReference Include="Azure.Core" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(IsSample)' == 'true'">