.NET 8 Improvements

### All Templates

- Use [simplified output paths](https://devblogs.microsoft.com/dotnet/announcing-dotnet-8-preview-3/#simplified-output-path).
- Optimize [Docker images](https://devblogs.microsoft.com/dotnet/announcing-dotnet-8-preview-3/#building-multi-platform-container-images)
- Secure [Docker images](https://devblogs.microsoft.com/dotnet/securing-containers-with-rootless/) also see https://github.com/dotnet/designs/pull/271.
- Switch from `ISystemClock` to new `TimeProvider` API.
- [Switch to `JsonStringEnumConverter<MyEnum>`](https://devblogs.microsoft.com/dotnet/system-text-json-in-dotnet-8/#jsonstringenumconvertertenum).
- [Populate getter collections when deserializing JSON](https://devblogs.microsoft.com/dotnet/system-text-json-in-dotnet-8/#populate-read-only-members)
- Specify serialization options at [compile time](https://devblogs.microsoft.com/dotnet/announcing-dotnet-8-preview-7/#jsonsourcegenerationoptionsattribute-feature-parity-https-github-com-dotnet-runtime-pull-88753).

### API Template

- [AOT](https://devblogs.microsoft.com/dotnet/asp-net-core-updates-in-dotnet-8-preview-3/#asp-net-core-and-native-aot-compatibility)

### Framework

- [Switch to official implementation](https://devblogs.microsoft.com/dotnet/caching-abstraction-improvements-in-aspnetcore/)
- Add extensions for [keyed services](https://devblogs.microsoft.com/dotnet/announcing-dotnet-8-preview-7/#keyed-services-support-in-microsoft-extensions-dependencyinjection)

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.NET 8 Improvements #1957

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.NET 8 Improvements #1957

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