* optimizations:
- rename update_crawl_config_stats to stats_recompute_all, only used in migration to fetch all crawls
and do a full recompute of all file sizes
- add stats_recompute_last to only get last crawl by size, increment total size by specified amount, and incr/decr number of crawls
- Update migration 0007 to use stats_recompute_all
- Add isCrawlRunning, lastCrawlStopping, and lastRun to
stats_recompute_last
- Increment crawlSuccessfulCount in stats_recompute_last
* operator/crawls:
- operator: keep track of filesAddedSize in redis as well
- rename update_crawl to update_crawl_state_if_changed() and only update
if state is different, otherwise return false
- ensure mark_finished() operations only occur if crawl is state has changed
- don't clear 'stopping' flag, can track if crawl was stopped
- state always starts with "starting", don't reset to starting
tests:
- Add test for incremental workflow stats updating
- don't clear stopping==true, indicates crawl was manually stopped
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Co-authored-by: Ilya Kreymer <ikreymer@gmail.com>