tracker-miner-fs: Process only one item at a time
Despite us spawning a number of tasks (10 currently) to process files in parallel, disk access is a bottleneck to them. Reduce this to 1, it doesn't seem to impact performance that much, and it does help in not processing files together that may not go in the same SPARQL update batch. This is irrelevant now, since the operation would be blocked by the parent being still processed, but we want to lighten that block in future commits.
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