S.S.C.Algorithms: Fix duplicate theories warning

[vcsjones]

xunit warning:

Skipping test case with duplicate ID '658dd5afec16f3397ac5ef6b298eb8b71ae5a86f' ('System.Security.Cryptography.Hashing.Algorithms.Tests.BlockSizeValueTests.BlockSizeValueTest(hmacBlockSizeValue: 64, expectedBlockSizeValue: 64)' and 'System.Security.Cryptography.Hashing.Algorithms.Tests.BlockSizeValueTests.BlockSizeValueTest(hmacBlockSizeValue: 64, expectedBlockSizeValue: 64)')

Since different HMAC algorithms have the same block size, the test cases was being folded down in to [64, 64], [128, 128].

Simplest change is to just break them in to individual facts. I don't anticipate new algorithms would be added frequently here.

This seems like a genuinely useful warning from xunit, so I don't expect we'd want to get in the habit of ignoring these.

[ghost]

Tagging subscribers to this area: @bartonjs, @vcsjones, @krwq
Notify danmosemsft if you want to be subscribed.

[vcsjones]

Hit #35753