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This PR adds a task to the cron service to allow garbage collection of LFS meta objects. As repositories may have a large number of LFSMetaObjects, an updated column is added to this table and it is used to perform a generational GC to attempt to reduce the amount of work. (There may need to be a bit more work here but this is probably enough for the moment.) Fix #7045 Signed-off-by: Andrew Thornton <art27@cantab.net>