CA1515 code fix should not fix suppressed warnings

[dnperfors]

Analyzer

Diagnostic ID: CA1515: Consider making public types internal

Analyzer source

SDK: Built-in CA analyzers in .NET 9 SDK or later

Version: SDK 9.0.102

Describe the bug

When opening our test project with .NET 9, several warnings appear saying that test classes need to be internal, instead of public. We use XUnit where this is not the case. Using xunit.analyzers we are able to suppress the warnings for the testclasses.
In the test project there are other classes that could be made internal, and when we use the code fix "Make the public type internal" on the whole project or solutions all types are marked as internal, even the test classes that no longer showed the warning.

Steps To Reproduce

1. Create a test project with xunit and xunit.analyzers
2. Add a test in a public class
3. Add a helper class and make it public
4. Build the project and notice that the helper class gets the warning
5. Run "Make the public type internal" code fix on the whole project

Expected behavior

The test classes that have CA1515 suppressed should not be fixed by the code fix

Actual behavior

The test classes that have CA1515 suppressed are 'fixed' by the code fix, but will now throw an error from xunit saying that test classes should be public.

Additional context

Additional libraries used:

• xunit 2.9.3
• xunit.analyzers 1.19.0

Related to #7192