"View comments" tool doesn't reliably detect comments

Common experience- the button/banner to check the review comments did not show up on https://github.com/microsoft/vscode/pull/330982, when it did have comments. I manually told the agent to check the comments, and it used the View Comments tool, but the tool returned that there were no comments. A minute later, it did successfully detect that there were comments, and I was able to click the button. I suspect that we just don't check this very often, but when the tool is run, we should specifically try to refresh the state of the PR to see whether there are comments on it instead of relying on a cached value.