[Http.Resilience documentation] Update recommendations how to fix a compatibility issue with .NET AppInsights

[iliar-turdushev]

Microsoft.Extensions.Http.Resilience package had a compatibility issue with .NET AppInsights, see microsoft/ApplicationInsights-dotnet#2879. It was documented in the README file and in the learn.microsoft.com article. The issue has been fixed in the AppInsights 2.223.0-beta1. Once a stable version of AppInsights 2.23.0 is released we'll need to:

• Ensure that the compatibility no more exists.
• Update the README file and the learn.microsoft.com article with recommendations how to fix the compatibility issue. Specifically, we need to add that the issue can be fixed by using .NET AppInsights version >=2.23.0. If a customer cannot update the library then they need to use a workaround already described in the documentation.

[iliar-turdushev]

Setting the blocked label until the stable version of the AppInsights 2.23.0 is released.