[Update article]: `OnXYZ` Event Subscriptions

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Proposed topic or title

New OnXYZ Methods for resource event subscriptions

Location in table of contents.

https://learn.microsoft.com/en-us/dotnet/aspire/app-host/eventing

Reason for the article

microsoft/aspire#10097 Introduces some new extension methods on IResourceBuilder<T> to enable easier event subscriptions. We should update references to eventing in our docs to use these new methods instead.

• OnBeforeResourceStarted
• OnConnectionStringAvailable
• OnInitializeResource
• OnResourceEndpointsAllocated
• OnResourceReady

Article abstract

N/A

Relevant searches

https://github.com/search?q=repo%3Adotnet%2Fdocs-aspire%20Subscribe&type=code

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Associated WorkItem - 447402