next/prev: Add `jj log` output to more prev_next tests. #141

Job	Run time
Build binary artifacts (linux-x86_64-musl)	4m 55s
Build binary artifacts (linux-x86_64-gnu)	5m 13s
Build binary artifacts (linux-aarch64-musl)	5m 20s
Build binary artifacts (linux-aarch64-gnu)	5m 20s
Build binary artifacts (macos-x86_64)	7m 56s
Build binary artifacts (macos-aarch64)	3m 54s
Build binary artifacts (win-x86_64)	8m 11s
	40m 49s

Provide feedback