Fix AbstractSemanticQuickInfoSourceTests.AssertTaggedText to respect expectedClassifications parameter

[Copilot]

Fixes #45893

Problem

The AssertTaggedText method in AbstractSemanticQuickInfoSourceTests was ignoring its expectedClassifications parameter. Tests calling methods like Documentation(), MainDescription(), etc. with ExpectedClassifications() were only validating the concatenated text, not the actual classification tags of each TaggedText element.

For example, this test was only checking that the text equals "This example shows how to specify the GenericClass<T> cref." but not verifying that "GenericClass" has the Class classification tag:

Documentation("This example shows how to specify the GenericClass<T> cref.",
    ExpectedClassifications(
        Text("This example shows how to specify the"),
        WhiteSpace(" "),
        Class("GenericClass"),
        Punctuation.OpenAngle,
        TypeParameter("T"),
        Punctuation.CloseAngle,
        WhiteSpace(" "),
        Text("cref.")));

Solution

Modified AssertTaggedText to use the existing ClassificationTestHelper.VerifyTextAndClassifications method when expectedClassifications is provided. This helper properly validates both:

1. The concatenated text matches the expected text
2. Each TaggedText element has the correct classification tag (e.g., Class, TypeParameter, Punctuation)

When expectedClassifications is null, the method continues to use the original simple text comparison, maintaining full backward compatibility.

Testing

• Verified builds succeed for both C# and VB EditorFeatures test projects
• Tests that pass ExpectedClassifications will now properly validate classification tags
• Tests without ExpectedClassifications continue to work unchanged

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>AbstractSemanticQuickInfoSourceTests.AssertTaggedText ignores 'expectedClassifications' input parameter</issue_title>
<issue_description>See 6e0b677#diff-e26a1fae499ea2c247aca446606e7c4bR62

Some tests seem to be passing non-default value. We should either remove or respect this parameter.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #45893

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