Revert Spark3 changes to image_suggestions.
This MR temporarily reverts changes from !186 (merged) and !188 (merged) so that we do not break production while we investigate how to properly do Cassandra loading on Spark3.
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This MR temporarily reverts changes from !186 (merged) and !188 (merged) so that we do not break production while we investigate how to properly do Cassandra loading on Spark3.