housekeeping: Replace commit-graph chain when missing generation data
Git will only read and write generation data from commit-graphs when the complete chain of graphs already has generation data. As a result, when we incrementally append a new commit-graph slice to the chain of graphs we won't generate the commit-graph data at all. We have essentially the same problem with bloom filters, where the current strategy is to just rewrite the complete commit-graph chain in case the chain is missing bloom filters. So let's do the same when they are missing generation data. Changelog: added
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