feat: Support SessionEndStatus.Unhandled

[bitsandfoxes]

Resolves #1721

Sessions can now be ended as Unhandled and this PR is the Unity specific followup of getsentry/sentry-dotnet#4653

1. Mark exceptions as Mechanism.Terminal = false; when capturing through our logging integrations
2. Update the LifecycleIntergration

[github-actions]

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## Unreleased

### Features

- Support `SessionEndStatus.Unhandled` ([#2365](https://github.com/getsentry/sentry-unity/pull/2365))

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