MNT: move context menu functionality upstream into `RootTreeView` #257

Job	Run time
standard / pre-commit checks / pre-commit	16s
standard / Documentation / Python 3.9: documentation building	47s
standard / Conda (3.10) / Python 3.10: conda	4m 19s
standard / Conda (3.11, true) / Python 3.11: conda	2m 55s
standard / Conda (3.12, true) / Python 3.12: conda	4m 34s
standard / Conda (3.9, true) / Python 3.9: conda	3m 9s
standard / Pip (3.10) / Python 3.10: pip	1m 12s
standard / Pip (3.11, true) / Python 3.11: pip	1m 7s
standard / Pip (3.12, true) / Python 3.12: pip	1m 19s
standard / Pip (3.9, true) / Python 3.9: pip	1m 18s
standard / Documentation / Documentation deployment	0s
	20m 56s

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