Short-lived hosted scenario.

[IEvangelist]

Summary

Add and detail an alternative approach to signaling completion for short-lived hosted scenarios.

Fixes #45902

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Internal previews

📄 File	🔗 Preview link
docs/core/extensions/workers.md	Worker services in .NET

[Copilot]

Pull Request Overview

This PR expands guidance on signaling completion for short-lived hosted services and introduces an alternative generic host approach for such scenarios.

• Updated metadata date and refined wording around signaling completion.
• Added a new “Alternative approach” section with sample csproj, Program, and JobRunner code.
• Demonstrates using the .NET Generic Host for run-once applications without a Worker class.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
docs/core/extensions/workers.md	Bumped ms.date, clarified ExecuteAsync link, expanded IMPORTANT note, and added an “Alternative approach” section.
docs/core/extensions/snippets/hosts/ShortLived.App.csproj	Introduced sample project file for a short-lived generic host app.
docs/core/extensions/snippets/hosts/Program.cs	Added example Program.cs using top-level statements, DI, and logging.
docs/core/extensions/snippets/hosts/JobRunner.cs	Added JobRunner class with primary constructor syntax and RunAsync.

Comments suppressed due to low confidence (1)

docs/core/extensions/snippets/hosts/ShortLived.App.csproj:1

• [nitpick] Consider using the base SDK (Microsoft.NET.Sdk) instead of Microsoft.NET.Sdk.Worker to better reflect a generic host project rather than a Worker service template.

<Project Sdk="Microsoft.NET.Sdk.Worker">