TUnit0004 rejects inherited property sources supplied by the derived test class #7551

An inherited property decorated with MethodDataSource("Rows") can resolve Rows on the derived test class during generated and reflection execution, but the analyzer reports TUnit0004 on the base property. This prevents compiling an otherwise supported data source.

Reproduction

In a TUnit test project:

public abstract class Base
{
    [TUnit.Core.MethodDataSource("Rows")]
    public int Value { get; set; }
}
public class Tests : Base
{
    public static int Rows() => 49;
    [TUnit.Core.Test]
    public void Test() { }
}

Expected and actual

Allow the derived test class to supply the property source, matching TestMetadataGenerator.GeneratePropertyDataSources and reflection execution. Currently TUnit0004 reports that the source method is missing at the base property.

Environment

Repository head a8babf9, SDK 10.0.403, macOS arm64. Found while validating #7547; its regression narrowly suppresses this diagnostic.

Acceptance criteria

• The reproduction compiles without suppressing TUnit0004 when the inherited property source is supplied by the concrete derived test class.
• Add analyzer regression coverage for this inherited-property case and retain diagnostics for genuinely missing data-source members.
• Verify the inherited property receives the derived source value in generated and reflection execution.