Revert NamedTemporaryFile ContextManager in example notebooks

[schuenke]

Reverts changes to examples from #498 because we decided NOT to use a context manager to open the data files and just ignore the RUFF rule in our example notebooks.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/mrpro/algorithms/csm
inati.py	24	1	96%	44
walsh.py	16	1	94%	34
src/mrpro/algorithms/dcf
dcf_voronoi.py	53	4	92%	15, 48–49, 76
src/mrpro/algorithms/optimizers
adam.py	20	1	95%	69
src/mrpro/algorithms/reconstruction
DirectReconstruction.py	28	16	43%	51–71, 85
IterativeSENSEReconstruction.py	13	1	92%	76
Reconstruction.py	50	22	56%	42, 54–56, 80–87, 104–113
RegularizedIterativeSENSEReconstruction.py	41	17	59%	96–100, 114–139
src/mrpro/data
AcqInfo.py	128	2	98%	174, 212
CsmData.py	29	3	90%	15, 82–84
DcfData.py	45	8	82%	18, 66, 78–83
IData.py	67	9	87%	119, 125, 129, 159–167
IHeader.py	75	7	91%	75, 109, 127–131
KHeader.py	165	17	90%	25, 127–131, 158, 210, 221, 228–229, 232, 239, 278–289
KNoise.py	31	15	52%	39–52, 56–61
KTrajectory.py	69	5	93%	178–182
MoveDataMixin.py	137	18	87%	15, 113, 129, 143–145, 207, 305–307, 320, 399, 419–420, 422, 437–438, 440
QData.py	39	7	82%	42, 65–73
Rotation.py	674	36	95%	100, 198, 335, 433, 477, 495, 581, 583, 592, 626, 628, 691, 768, 773, 776, 791, 808, 813, 889, 1077, 1082, 1085, 1109, 1113, 1240, 1242, 1250–1251, 1315, 1397, 1608, 1690, 1846, 1881, 1885, 1996
SpatialDimension.py	230	21	91%	33, 103, 128, 135, 141, 261–263, 276–278, 312, 330, 343, 356, 369, 382, 391–392, 407, 416
TrajectoryDescription.py	14	1	93%	23
acq_filters.py	10	1	90%	47
src/mrpro/data/_kdata
KData.py	105	16	85%	108–109, 118, 126, 180–181, 216, 221–222, 241–252
KDataRemoveOsMixin.py	29	2	93%	44, 46
KDataSelectMixin.py	21	2	90%	48, 64
KDataSplitMixin.py	49	3	94%	51, 81, 90
src/mrpro/data/traj_calculators
KTrajectoryCalculator.py	25	2	92%	23, 45
KTrajectoryIsmrmrd.py	13	2	85%	41, 50
KTrajectoryPulseq.py	29	1	97%	54
src/mrpro/operators
CartesianSamplingOp.py	50	4	92%	49–50, 90, 116
ConstraintsOp.py	60	2	97%	46, 48
EndomorphOperator.py	65	2	97%	228, 234
FiniteDifferenceOp.py	27	2	93%	40, 105
FourierOp.py	77	1	99%	131
Functional.py	71	5	93%	20–22, 117, 119
GridSamplingOp.py	136	9	93%	72–73, 82–83, 90–91, 94, 96, 98
LinearOperator.py	171	12	93%	55, 91, 190, 220, 261, 270, 278, 287, 295, 320, 418, 423
LinearOperatorMatrix.py	158	16	90%	82, 119, 152, 161, 166, 175–178, 191–194, 203, 215, 304, 331, 359
MultiIdentityOp.py	13	2	85%	43, 48
Operator.py	78	2	97%	25, 74
ProximableFunctionalSeparableSum.py	39	3	92%	50, 103, 110
SliceProjectionOp.py	173	8	95%	44, 61, 63, 69, 206, 227, 260, 300
WaveletOp.py	120	5	96%	152, 170, 205, 210, 233
ZeroPadOp.py	16	1	94%	30
src/mrpro/utils
filters.py	62	2	97%	44, 49
modify_acq_info.py	17	1	94%	12
slice_profiles.py	46	6	87%	20, 36, 113–116, 149
sliding_window.py	34	1	97%	34
split_idx.py	10	2	80%	43, 47
summarize_tensorvalues.py	11	9	18%	20–29
typing.py	18	11	39%	8–23
zero_pad_or_crop.py	31	6	81%	26, 30, 54, 57, 60, 63
TOTAL	4738	353	93%

Tests	Skipped	Failures	Errors	Time
1953	0 💤	0 ❌	0 🔥	1m 40s ⏱️

[github-actions]

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[fzimmermann89]

Thanks!

Any objections to merging it?