chore: use Directory.Packages.props

Author: Meir017

src/FluentAssertions.Analyzers.Tests/FluentAssertions.Analyzers.Tests.csproj

@@ -7,10 +7,15 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.msbuild">
+    <PackageReference Include="coverlet.msbuild" >
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
+    <PackageReference Include="FluentAssertions" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="MSTest.TestAdapter" />
+    <PackageReference Include="MSTest.TestFramework" />
+    <PackageReference Include="xunit.assert" />
   </ItemGroup>
 
   <ItemGroup>