Codify the expectation that in-place experiment construction does not rely on TileFetcher data #1389
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When we construct an experiment in-place, the source data comes from the tiles already on disk. Therefore, whatever image data we provide the TileFetcher that we pass into
write_experiment_json
should be discarded. This verifies that the data from the tiles on the disk are what gets constituted into the experiment, and that the data returned by TileFetcher is ignored.Test plan: passed the test.
Fixes #1388