fix(source-maps): Use alternate source map bias only if the default returns null and the alternate does not. Remove as user option to reduce config confusion. #303
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In an effort to reduce config options (and confusion), this removes the sourceMapBias param from the launch config. The default source map bias is 'leastUpperBound', which works with our published ts config in TS Starter. This config is also used in the source-map unit tests. If leastUpperBound fails, it will try greatestLowerBound but will not switch to that as the preferred bias unless it succeeds.