pageserver: add more info-level logging in shard splits #22816

Job	Run time
check-permissions / check-permissions	1s
tag	13s
cancel-previous-e2e-tests	2s
check-build-tools-image / check-image	5s
build-build-tools-image / check-image / check-image	5s
trigger-custom-extensions-build-and-wait	5m 21s
build-build-tools-image / build-image	0s
build-build-tools-image / merge-images	0s
check-codestyle-python	31s
check-codestyle-rust	16m 40s
build-neon (debug)	12m 46s
build-neon (release)	14m 33s
neon-image-arch (x64)	9m 8s
compute-node-image-arch (v14, x64)	6m 53s
neon-image-arch (arm64)	15m 35s
get-benchmarks-durations	0s
compute-node-image-arch (v14, arm64)	12m 11s
compute-node-image-arch (v15, x64)	6m 46s
compute-node-image-arch (v15, arm64)	11m 59s
compute-node-image-arch (v16, x64)	7m 29s
compute-node-image-arch (v16, arm64)	12m 56s
compute-node-image (v14)	19s
compute-node-image (v15)	19s
compute-node-image (v16)	22s
vm-compute-node-image (v14)	1m 44s
vm-compute-node-image (v15)	1m 34s
vm-compute-node-image (v16)	1m 40s
regress-tests (debug, v14)	22m 58s
regress-tests (debug, v15)	20m 43s
benchmarks	0s
regress-tests (debug, v16)	22m 37s
regress-tests (release, v14)	11m 34s
regress-tests (release, v15)	11m 1s
regress-tests (release, v16)	10m 56s
neon-image	46s
test-images (x64)	9m 54s
test-images (arm64)	13m 10s
promote-images	49s
trigger-e2e-tests	0s
coverage-report (debug)	5m 49s
promote-compatibility-data	0s
pin-build-tools-image	0s
deploy	0s
create-test-report	1m 56s
report-benchmarks-failures	0s
	4h 31m 25s

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