The integration test expectes to find a certain phrase from the
extractor repeated in the _stderr_ of `codeql test run`. However, that
subcommand is about to start reproducing the extractor output as-is,
which means the phrase will instead appear in _stdout_.
Change the integration test to capture all of the output, so it
will keep passing across the change.
Also accept `options.yml` and `options.yaml` files as well for test options,
to get YAML syntax highlighting. In a follow up PR we might make the extension
mandatory.
