Needs to use IHttpClientFactory instead of creating HttpClient instance

[hswami]

In keeping with .NET guidance, the ReportingService should not be creating HttpClient using new(), it should be using the IHttpClientFactory.

See https://learn.microsoft.com/en-us/dotnet/core/extensions/httpclient-factory for more information.

The rationale is that we cannot simply enable resilience on the API without writing a custom wrapper and/or implementation to do so.

See https://learn.microsoft.com/en-us/dotnet/core/resilience/http-resilience for more information.