ASP.NET Core project templates use latest C# language idioms

[DamianEdwards]

In .NET 6, the included C# project templates will use the latest language idioms.

See the parent Epic for details.

• Top-level statements
  • Use top level program for the Worker template #33853
  • Do in conjunction with Update ASP.NET Core C# project templates to use new minimal hosting APIs in .NET 6 #33944
• Global using directives
  • ℹ️ This will be via SDK driven defaults, in PR Add global usings for .NET projects (.NET SDK, Web and Worker) sdk#18459
  • Remove usings from templates implicitly added by the SDK #34219
• File-scoped namespaces (blocked until Merge FileScopedNamespaces to main roslyn#54724 is pushed & flows)
• Nullable reference types
  • Enable nullable references in project templates #34007
  • .razor components produce an unfixable warning when using @implements or @inherits with a generic type #32733
• async Main

Related:

• Templates aren't C# 8.0 nullability compliant by default #10921
• enable nullable for new projects #32756

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