The CORS Policy for SignalR also requires allowing DELETE

### Description

The list currently mentions only POST and GET, but for the Long Polling transport, DELETE is issued by the client as well:

https://github.com/dotnet/aspnetcore/blob/v10.0.2/src/SignalR/clients/ts/signalr/src/LongPollingTransport.ts#L173-L184

### Page URL

https://learn.microsoft.com/en-us/aspnet/core/signalr/security?view=aspnetcore-10.0

### Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/signalr/security.md

### Document ID

58e87eb0-240b-ab00-c5f4-32a0ab2e0028

### Platform Id

be1a5417-78c4-e115-0552-09f7ddc509c4

### Article author

@wadepickett

### Metadata

* ID: 8af11946-ea05-3be2-6fa1-c4c01aa76d8c
* PlatformId: be1a5417-78c4-e115-0552-09f7ddc509c4
* Service: **aspnet-core**
* Sub-service: **aspnetcore-signalr**

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