fix: add ConfigSetCommandTests to ConfigFile collection for test isol…

…ation

The class was missing [Collection("ConfigFile")] which caused it to run
in parallel with ConfigPersistenceTests. Both classes interact with
user-secrets, leading to corrupt secrets.json on CI runners.

Added IDisposable with CleanupUserSecrets() to match the pattern used
by ConfigPersistenceTests and ConfigurationFactoryTests.

Co-authored-by: Copilot <[email protected]>

docs: update trinity history and decision log for NuGet publish

Co-authored-by: Copilot <[email protected]>