Generate concrete behavior registrations

[viceroypenguin]

Motivation

• Avoid emitting open-generic DI registrations for behaviors so runtime DI (and Native AOT) won't try to construct open-generic services for value-type responses.
• Ensure the same closed generic behavior types used when generating handler pipelines are registered in the service-collection extension.

Description

• Build concrete, per-handler behavior registrations by evaluating each handler's RequestType/ResponseType and applicable behaviors instead of emitting an open generic typeof(Behavior<,>) registration.
• Centralize behavior type formatting with a new helper GetBehaviorTypeName and reuse it for both handler generation and service registrations.
• Update the service-collection template ServiceCollectionExtensions.sbntxt to register typeof({{ b.type_name }}) (closed type) instead of an open generic.
• Remove the unused RegistrationType model property and add a new unit test BehaviorsUseConcreteRegistrations in tests/Immediate.Handlers.Tests/GeneratorTests/AddHandlersTests.cs that asserts concrete registrations are emitted for explicit and implicit (ValueTuple) responses.

Testing

• Ran dotnet test tests/Immediate.Handlers.Tests/Immediate.Handlers.Tests.csproj -f net10.0 --no-restore and observed 151 tests passed.
• Ran the solution test run (dotnet test Immediate.Handlers.slnx) where the tests executed for .NET 10 and .NET 11 passed (combined run covered 356 tests for available runtimes), while the overall command reported unavailable runtimes for .NET 8/.NET 9 in the environment.
• Ran git diff --check to verify no whitespace/merge issues were introduced.

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