Truncate save_expval #2827

Job	Run time
lint (3.10)	1m 14s
sdist (3.8, ubuntu-latest, x64)	2m 47s
sdist (3.9, ubuntu-latest, x64)	2m 59s
sdist (3.10, ubuntu-latest, x64)	2m 49s
sdist (3.11, ubuntu-latest, x64)	2m 59s
sdist (3.12.0, ubuntu-latest, x64)	3m 10s
Linux Python 3.8	12m 8s
Linux Python 3.9	13m 40s
tests-json-input (3.10, ubuntu-latest)	13m 47s
Windows Python 3.8	10m 59s
macOS Python 3.8	16m 28s
Linux Python 3.10	13m 22s
Windows Python 3.9	13m 19s
Linux Python 3.11	10m 10s
macOS Python 3.9	17m 43s
Windows Python 3.10	16m 3s
macOS Python 3.10	13m 14s
Linux Python 3.12.0	12m 44s
Windows Python 3.11	10m 36s
macOS Python 3.11	21m 35s
Linux Python 3.10 ('qiskit>=1.0.0rc1')	11m 54s
Windows Python 3.12.0	12m 58s
macOS Python 3.12.0	17m 51s
	4h 14m 29s

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