runtime: FailFast logging should include inner exception details and stacktrace

We introduced FailFast logging with this change: https://github.com/dotnet/coreclr/commit/0c4a490 but are currently ignoring the passed exception data and stacktrace when calling FailFast(string,Exception). We currently output the stacktrace that originates from the FailFast call.

This issue was reported here: https://github.com/dotnet/corefx/issues/25477 Related issue:

• https://github.com/dotnet/coreclr/issues/14037
• https://github.com/dotnet/coreclr/issues/14867

cc @danmosemsft @jkotas