Report progress for post-evaluation actions

[nickrolfe]

Generating and parsing log summaries can be quite slow, so we should update the progress window with messages about what's being worked on.

I don't really know TypeScript, so there may be a nicer way of achieving what I've done here. 🤷

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[aeisenberg]

Nice. LGTM. Can you add a changelog entry for this?

I wonder (and this is unrelated to your change) if we can summarize the evaluator logs in the background after showing the results for the query. There's no reason why the results view should be blocked while we're summarizing evaluator logs.