Retrieve iframe console logs

I'm using vscode-extension-tester to add some functional coverage to an extension that contains several webviews. Recently we have started to see some test failures in our CI pipeline that we aren't able to reproduce locally. It would be useful to be able to dump all the console logs produced by every iframe to a file to understand what's the root cause of the issue.

I've tried the following code snippet but it returns the extension host logs, which aren't very helpful when debugging issues in the iframes.

let logEntries = await driver.manage().logs().get(logging.Type.BROWSER);
let logOutput = '';
logEntries.forEach((entry) => {
    logOutput += `[${entry.level}] ${entry.timestamp} : ${entry.message}\n`;
});

Start with the WebDriver logging call shown in the issue, driver.manage().logs().get(logging.Type.BROWSER), and trace how iframe or webview contexts are handled. Done means console logs from every iframe can be collected and written to a file without returning only extension-host logs; add or update coverage for that behavior if the relevant tests are found.