.NET: Fix AddWorkflow default lifetime to Transient for concurrent runs

[Greal-dev]

Changes the default DI lifetime for AddWorkflow from ServiceLifetime.Singleton to ServiceLifetime.Transient to prevent TakeOwnership conflicts when running multiple concurrent workflow executions. Since Workflow is a stateful object with exclusive ownership semantics, registering it as a singleton makes it impossible to safely handle parallel requests targeting the same workflow key. The corresponding test is updated to reflect the new default behavior.

Addresses #3620.

[lokitoth]

Technically we may want to let users set this themselves also: If they have a workflow that will run using the Concurrent mode of OffThread execution, then so long as all executors are properly set up for concurrency it will work too.

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[lokitoth]

@Greal-dev Thank you for the contribution! If possible, please agree to the CLA, so we can expedite merging the change