commit-graph: introduce `commit_graph_generation_from_graph()`

In 2ee11f7261 (commit-graph: return generation from memory, 2023-03-20), the `commit_graph_generation()` function stopped returning zeros when asked to locate the generation number of a given commit. This was done at the time to prepare for a later change which set generation values in memory, meaning that we could no longer rely on `graph_pos` alone to tell us whether or not to trust the generation number returned by this function. In 2ee11f7261, it was noted that this change only impacted very old commit-graphs, which were written with all commits having generation number 0. Indeed, zero is not a valid generation number, so we should never expect to see that value outside of the aforementioned case. The test fallout in 2ee11f7261 indicated that we were no longer able to fsck a specific old case of commit-graph corruption, where we see a non-zero generation number after having seen a generation number of 0 earlier. Introduce a variant of `commit_graph_generation()` which behaves like that function did prior to 2ee11f7261, known as `commit_graph_generation_from_graph()`. Then use this function in the context of `verify_one_commit_graph()`, where we only want to trust the values from the graph. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>