Set L1ResultKey to empty string on BS jobs

Jon Burr requested to merge jburr/athena:ATR-25114 into master

Closes ATR-25114.

I also tightened up the existing code slightly. It now will not fall back on the ROI version if it fails to retrieve the L1 result but was configured to do so (which is indicative of an upstream error) but only if it was configured to ignore the CTP version.

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