smTestDriver: add documentation for features supported
The following discussion from !6253 should be addressed:
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@cory.quammen started a discussion: (+1 comment) This seems like a reasonable change to me. There isn't a clear place for documentation for this environment variables (or the previously existing environment variable), so I suggest just merging as is as it adds a useful feature and the lack of documentation does not make anything worse.
smTestDriver
has all kinds of hidden knobs that we should document. Somewhere.