BUG: store _setpoint_pv in Target where possible #366

Job	Run time
standard / pre-commit checks / pre-commit	15s
standard / Documentation / Python 3.9: documentation building	2m 15s
standard / Conda (3.10) / Python 3.10: conda	4m 2s
standard / Conda (3.11, true) / Python 3.11: conda	4m 3s
standard / Conda (3.12, true) / Python 3.12: conda	4m 5s
standard / Conda (3.9, true) / Python 3.9: conda	4m 26s
standard / Pip (3.10) / Python 3.10: pip	3m 25s
standard / Pip (3.11, true) / Python 3.11: pip	3m 10s
standard / Pip (3.12, true) / Python 3.12: pip	3m 21s
standard / Pip (3.9, true) / Python 3.9: pip	3m 13s
standard / Documentation / Documentation deployment	0s
	32m 15s

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