CollectCommandProviderConfigurationConsolidation fails

Observed in [test run](https://dev.azure.com/dnceng/internal/_build/results?buildId=2889106&view=ms.vss-test-web.build-test-results-tab&runId=56280549&resultId=100066&paneView=debug):

Test failed: `Microsoft.Diagnostics.Tools.Trace.CollectCommandFunctionalTests.CollectCommandProviderConfigurationConsolidation` with empty collect args:

```
Assert.Equal() Failure: Values differ
Expected: 0
Actual: 2
```
at https://github.com/dotnet/diagnostics/blob/main/src/tests/dotnet-trace/CollectCommandFunctionalTests.cs#L56. Unclear what caused it since the MockConsole swallowed all output. An option to improve this would be to inject `ITestOutputHelper` into the constructor of the class and have the mock console multiplex the output.