Hostname validation against server's certificate for HTTPs Ingress backends

When Ingress backend uses HTTPs request forwarding fails with something like:
```
System.Net.Http.HttpRequestException: 'The SSL connection could not be established, see inner exception.'
AuthenticationException: The remote certificate is invalid according to the validation procedure: RemoteCertificateNameMismatch
```

This happens because the ingress controller resolves the backend service to a set of endpoints which are IP addresses. `ClusterConfig.Destinations` in turn has addresses with just IPs. When forwarding the request there is no information about the destination hostname and therefore server's certificate validation fails.

There are couple workarounds:
1. Use `HttpClientConfig.DangerousAcceptAnyServerCertificate`
2. Define a transform on the ingress rule to set `Host` header:
```
annotations:
yarp.ingress.kubernetes.io/transforms: |
- RequestHeader: Host
Set: "my.backend.hostname"
```

I'm creating this for awareness for others running into the same issue and to discuss if there is anything can be done for it to just work.