arkon 972ada85ac Clean up fetch interval tests a bit
Also limit the dates we look at to most recent 10 distinct dates only. Closes #9930

(cherry picked from commit 6663abebaf69241741d0702331857951834ba806)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestorer.kt
#	app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt
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..
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