Private static field causes false positive for analyzer rule MSTEST0005

[abatishchev]

Describe the bug

A private static field of type TestContext causes a false positive for rule MSTEST0005:

Property 'TestContext' should be valid

Steps To Reproduce

The following code:

[TestClass]
public class MiseCorrelationIdProviderTests
{
    private static TestContext _context;

    [ClassInitialize]
    public static void ClassInitialize(TestContext context) =>
        _context = context;
}    

causes the following warning:

Expected behavior

A field does not trigger a rule for a property.

Actual behavior

It does.

Additional context

<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
<PackageVersion Include="MSTest.TestAdapter" Version="3.7.0" />
<PackageVersion Include="MSTest.TestFramework" Version="3.7.0" />
<GlobalPackageReference Include="MSTest.Analyzers" Version="3.7.0">
  <PrivateAssets>all</PrivateAssets>
  <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</GlobalPackageReference>