modify template accordingly to recent changes (Azure#23155)

* modify template accordingly to recent changes

* resolve comments

* remove a useless flag

* change default version number

* remove the extra flag in test project

Author: ArcturusZhang

eng/templates/Azure.ResourceManager.Template/src/Azure.ResourceManager.Template.csproj

@@ -1,11 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <Version>1.0.0-preview.1</Version>
+    <Version>1.0.0-beta.1</Version>
     <PackageId>Azure.ResourceManager.Template</PackageId>
     <Description>Azure Resource Manager client SDK for Azure resource provider ProviderFullName</Description>
     <PackageTags>azure;management;arm;resource manager;ProviderNameLowercase</PackageTags>
   </PropertyGroup>
-  <ItemGroup>
-    <PackageReference Include="Azure.ResourceManager.Core"/>
-  </ItemGroup>
 </Project>

eng/templates/Azure.ResourceManager.Template/tests/Azure.ResourceManager.Template.Tests.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <ItemGroup>
-    <PackageReference Include="Azure.ResourceManager.Core"/>
     <ProjectReference Include="..\src\Azure.ResourceManager.Template.csproj" />
   </ItemGroup>
 </Project>