[CLI] Include compiler diagnostics in the xml output file of the roslynator analyze command

[PeterKaszab]

Product and Version Used:
Roslynator.DotNet.Cli 0.3.3.0

Steps to Reproduce:

1. Create a new console application
2. Place the following class to the Program.cs file:

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int x, y;
            Console.WriteLine("Hello, World!");
        }

        public int Add(int x, int y)
        {
            return x + y;
        }
    }
}

3. Run roslyn analyze path\to\solution\ConsoleApp.sln --output out.xml ( The --ignore-compiler-diagnostics parameter is not provided.)

Actual Behavior:
The compiler diagnostics are missing from the list of project diagnostics, but they are present in the summary. Console and text file loggers list the mentioned diagnostics correctly.

<?xml version="1.0" encoding="utf-8"?>
<Roslynator>
  <CodeAnalysis>
    <Summary>
      <Diagnostic Id="CA1822" Title="Mark members as static" Count="1" />
      <Diagnostic Id="CS0168" Title="Variable is declared but never used" Count="2" />
    </Summary>
    <Projects>
      <Project Name="ConsoleApp" FilePath="C:\ConsoleApp\ConsoleApp\ConsoleApp.csproj">
        <Diagnostics>
          <Diagnostic Id="CA1822">
            <Severity>Info</Severity>
            <Message>Mark members as static</Message>
            <FilePath>C:\ConsoleApp\ConsoleApp\Program.cs</FilePath>
            <Location Line="11" Character="20" />
          </Diagnostic>
        </Diagnostics>
      </Project>
    </Projects>
  </CodeAnalysis>
</Roslynator>

Expected Behavior:

<?xml version="1.0" encoding="utf-8"?>
<Roslynator>
  <CodeAnalysis>
    <Summary>
      <Diagnostic Id="CA1822" Title="Mark members as static" Count="1" />
      <Diagnostic Id="CS0168" Title="Variable is declared but never used" Count="2" />
    </Summary>
    <Projects>
      <Project Name="ConsoleApp" FilePath="C:\ConsoleApp\ConsoleApp\ConsoleApp.csproj">
        <Diagnostics>
          <Diagnostic Id="CA1822">
            <Severity>Info</Severity>
            <Message>Mark members as static</Message>
            <FilePath>C:\ConsoleApp\ConsoleApp\Program.cs</FilePath>
            <Location Line="11" Character="20" />
          </Diagnostic>
          <Diagnostic Id="CS0168">
            <Severity>Warning</Severity>
            <Message>Variable is declared but never used</Message>
            <FilePath>C:\ConsoleApp\ConsoleApp\Program.cs</FilePath>
            <Location Line="7" Character="17" />
          </Diagnostic>
          <Diagnostic Id="CS0168">
            <Severity>Warning</Severity>
            <Message>Variable is declared but never used</Message>
            <FilePath>C:\ConsoleApp\ConsoleApp\Program.cs</FilePath>
            <Location Line="7" Character="20" />
          </Diagnostic>
        </Diagnostics>
      </Project>
    </Projects>
  </CodeAnalysis>
</Roslynator>