Account for CPU tuple cost in DecompressChunk #26944

Job	Run time
matrixbuilder	8s
PG14.15 Debug ubuntu-22.04	11m 55s
PG15.10 Debug ubuntu-22.04	11m 48s
PG16.6 Debug ubuntu-22.04	11m 48s
PG17.2 Debug ubuntu-22.04	12m 5s
PG17.2 Release macos-13	10m 41s
PG17.2 ReleaseWithoutTelemetry ubuntu-22.04	10m 23s
PG16.6 Flaky Check Debug ubuntu-22.04	8m 40s
PG17.2 Flaky Check Debug ubuntu-22.04	8m 47s
	1h 26m 15s

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