t6600: add clock-skew topologies and step counts for edge cases

Add topologies and tests exercising paint_down_to_common() under
clock skew, where commit-date ordering (v1 commit-graph without
corrected commit dates) violates the topological invariant that
children are dequeued before parents:

 - se-*: side-exhaustion fires too early when one paint side fully
   drains from the queue while a low-date ancestor on the other
   side is still queued

 - se2-*: side-exhaustion returns a too-deep merge base because
   the correct (closer) base never receives both paint sides

Also add step counts to the edge-case tests from the previous
commit, a mixed finite/INFINITY generation topology exercising
the transition from INFINITY-generation commits to graph-backed
commits, and step counts for the grid-based merge-base test.

Signed-off-by: Kristofer Karlsson <krka@spotify.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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