Background tasks with hosted services: Container issue

32K PV

This is the Container issue for this doc. If you PR this doc and don't fix all the issues, open the issues you fix and close against that.

PU issues:
- [ ] Hosted Service Threading Model Not Documented #17604
- [ ] Consuming Background Services via Dependency Injection Not Documented #17603
- [ ] TimedHostedService #17450
- [ ] Add information about unhandled exceptions thrown in BackgroundService #16938
- [ ] React to Ctrl+C UseConsoleLifetime issue with VSC #14489
- [ ] Describe relevance of returned Tasks from StartAsync and StopAsync #14156
- [ ] Services that depend on HttpContextAccessor #17959

**_Not_** PU issues:
- [ ]
- [ ]


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#### Document Details

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* ID: c3460b0d-9c60-3a06-ac63-18cf990e53c3
* Version Independent ID: b2dece1f-15b8-03af-6d52-7cc070432b4b
* Content: [Background tasks with hosted services in ASP.NET Core](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?view=aspnetcore-3.1&tabs=visual-studio)
* Content Source: [aspnetcore/fundamentals/host/hosted-services.md](https://github.com/dotnet/AspNetCore.Docs/blob/master/aspnetcore/fundamentals/host/hosted-services.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-fundamentals**
* GitHub Login: @Rick-Anderson
* Microsoft Alias: **riande**