Only call outputChannel.show(preserveFocus: false) on `Warning` and `Error`output

### Is your feature request related to a problem? Please describe.

When `ms-dotnettools.vscode-dotnet-runtime` shows its Output on `Info`/`Debug`/`Trace`-level output, it yanks focus away other extensions' more important `Error` and `Warning` logs.

This has caused other extensions' users to post .NET Runtime's logs instead of the corresponding extension's logs.

### A clear and concise description of what you want to happen. Include any alternative solutions you've considered.

1. Update logger output to use VSCode's newer API.
2. Use the Output API's "Log Level" feature to filter logging output.
3. Only call `outputChannel.show(true)` when the logging entry' logging level is `Warning` and `Error`.

### Describe the solution you'd like

See above

### Additional context

_No response_