modify low_rank for one-body-matrix truncation reference #584

Job	Run time
Coverage check	8m 2s
Lint check	1m 45s
Type check	1m 7s
Format check	46s
Pytest Resource Estimates (ubuntu-latest, 3.10, ~=1.0)	1m 53s
Pytest Resource Estimates (macos-latest, 3.10, ~=1.0)	3m 55s
Pytest (ubuntu-latest, 3.10, ~=1.0)	6m 3s
Pytest (macos-latest, 3.10, ~=1.0)	7m 0s
Pytest (windows-latest, 3.10, ~=1.0)	6m 12s
Pytest (ubuntu-latest, 3.8, ~=0.15.0)	6m 34s
	43m 17s

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