Multiple TestCase attributes not allowed with DataPoint

Id	Category	Severity	Enabled
GdUnit0201	Attribute Usage	Error	True

Problem Description

Methods decorated with DataPoint attribute can only have one TestCase attribute. Multiple TestCase attributes on a method that uses DataPoint will result in undefined behavior.

Error example:

    [TestCase]
    [TestCase] // ❌ GdUnit0201: Method 'TestDataPointProperty' cannot have multiple TestCase attributes when DataPoint attribute is present
    [DataPoint(nameof(ArrayDataPointProperty))]
    public void TestDataPointProperty(int a, int b, int expected) 
    {
        AssertThat(a + b).IsEqual(expected);
    }

How to fix:

Use only one TestCase attribute with DataPoint:

    [TestCase] // ✅ Correct: Single TestCase with DataPoint
    [DataPoint(nameof(ArrayDataPointProperty))]
    public void TestDataPointProperty(int a, int b, int expected) 
    {
        AssertThat(a + b).IsEqual(expected);
    }