Consolidate cryptography tests to System.Security.Cryptography

With #55690 merged, the implementations of the S.S.Cryptography assemblies have been consolidated in to a single in-box assembly, where possible.

The unit tests for these are still in their separate projects however, such as S.S.C.Algorithms, S.S.C.Cng, etc.

This issue is to track consolidating them under System.Security.Cryptography. Note that this is not as simple as moving the files and adjusting namespaces. We made heavy use of partials to test different implementations of algorithms (internal vs public CNG for example). The partial approach won't work. The current solution is to refactor to a "driver" base type and test each implementation as a derived type.

Huh, thought I'd opened this already. But, I hadn't. Thanks 😄.

https://github.com/bartonjs/runtime/commits/crypto_test_model has my first-draft thoughts here. They seemed to be fruitful, but certainly aren't a commitment.

@ViktorHofer

We could move X509Certificates pretty easily, if not for:

runtime/src/libraries/System.Security.Cryptography.X509Certificates/tests/AssemblyInfo.cs

Line 8 in c3cc9fd

    
           [assembly: ActiveIssue("https://github.com/dotnet/runtime/issues/57810", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsMariner))]

I don't think we want to disable all of S.S.Cryptography tests on Mariner. But do we actually need to disable X509Certificates on Mariner? According to #57810 (comment), that ActiveIssue didn't stop the Mariner crashes.

I think the given options are:

Block moving X509Certificate tests until System.Security.Cryptography.X509Certificates.Tests crashing on Mariner OS #57810 is solved.
Put ActiveIssue on every single X509Certificates class, and future classes.
Move all of the tests anyway and remove the assembly-level ActiveIssue since prior comment indicated it did not help. If that is true, then what is being done for Mariner? Are tests running, or did we disable them some other way?

cc @ViktorHofer in case you have any insight on the X509Certificate tests in Mariner.