fix: Do not use aspect ratio of 1 for residual plot

[glemaitre]

closes #1292

We forced the aspect ratio of 1.0 for the residual plot. However the residual is computing actual vs predicted and the scale of the residual can be really different from the prediction if the error is low, explaining the problem of the plot.

This PR only set the aspect ratio for the actual vs predicted plot only.

[github-actions]

Coverage Report for backend

File	Stmts	Miss	Cover	Missing
venv/lib/python3.12/site-packages/skore
__init__.py	14	0	100%
__main__.py	8	8	0%	3–19
exceptions.py	4	4	0%	4–23
venv/lib/python3.12/site-packages/skore/cli
__init__.py	5	5	0%	3–8
cli.py	22	22	0%	3–70
color_format.py	49	49	0%	3–116
venv/lib/python3.12/site-packages/skore/persistence
__init__.py	0	0	100%
venv/lib/python3.12/site-packages/skore/persistence/item
__init__.py	56	3	93%	96–99
altair_chart_item.py	19	1	91%	14
item.py	22	1	95%	86
matplotlib_figure_item.py	36	1	95%	19
media_item.py	22	0	100%
numpy_array_item.py	27	1	94%	16
pandas_dataframe_item.py	29	1	94%	14
pandas_series_item.py	29	1	94%	14
pickle_item.py	22	0	100%
pillow_image_item.py	25	1	93%	15
plotly_figure_item.py	20	1	92%	14
polars_dataframe_item.py	27	1	94%	14
polars_series_item.py	22	1	92%	14
primitive_item.py	23	2	91%	13–15
sklearn_base_estimator_item.py	29	1	94%	15
skrub_table_report_item.py	10	1	86%	11
venv/lib/python3.12/site-packages/skore/persistence/repository
__init__.py	2	0	100%
item_repository.py	59	5	91%	15–16, 202–203, 226
venv/lib/python3.12/site-packages/skore/persistence/storage
__init__.py	4	0	100%
abstract_storage.py	22	0	100%
disk_cache_storage.py	33	1	95%	44
in_memory_storage.py	20	0	100%
venv/lib/python3.12/site-packages/skore/persistence/view
__init__.py	2	2	0%	3–5
view.py	5	5	0%	3–20
venv/lib/python3.12/site-packages/skore/project
__init__.py	3	0	100%
_launch.py	150	1	99%	278
_open.py	9	0	100%
project.py	62	1	99%	234
venv/lib/python3.12/site-packages/skore/sklearn
__init__.py	4	0	100%
_base.py	140	14	90%	36, 48, 58, 91, 94, 147–156, 168–>173, 183–184
find_ml_task.py	49	1	97%	103–>111, 135
types.py	2	0	100%
venv/lib/python3.12/site-packages/skore/sklearn/_cross_validation
__init__.py	5	0	100%
metrics_accessor.py	140	0	99%	128–>139
report.py	95	0	100%
venv/lib/python3.12/site-packages/skore/sklearn/_estimator
__init__.py	5	0	100%
metrics_accessor.py	255	9	95%	148–157, 182–>191, 190, 230–>232, 256, 283–287, 302, 320
report.py	120	0	99%	213–>219, 221–>223
utils.py	11	11	0%	1–19
venv/lib/python3.12/site-packages/skore/sklearn/_plot
__init__.py	4	0	100%
precision_recall_curve.py	119	1	98%	229–>246, 317
prediction_error.py	95	1	98%	159, 173–>176
roc_curve.py	126	0	100%
utils.py	89	5	93%	23, 47–49, 53
venv/lib/python3.12/site-packages/skore/sklearn/train_test_split
__init__.py	0	0	100%
train_test_split.py	36	2	94%	16–17
venv/lib/python3.12/site-packages/skore/sklearn/train_test_split/warning
__init__.py	8	0	100%
high_class_imbalance_too_few_examples_warning.py	17	3	78%	16–18, 80
high_class_imbalance_warning.py	18	2	88%	16–18
random_state_unset_warning.py	11	1	87%	15
shuffle_true_warning.py	9	0	91%	44–>exit
stratify_is_set_warning.py	11	1	87%	15
time_based_column_warning.py	22	1	89%	17, 69–>exit
train_test_split_warning.py	5	1	80%	21
venv/lib/python3.12/site-packages/skore/ui
__init__.py	0	0	100%
app.py	32	32	0%	3–83
dependencies.py	4	4	0%	3–10
project_routes.py	41	41	0%	3–92
serializers.py	77	77	0%	3–194
server.py	17	17	0%	3–40
venv/lib/python3.12/site-packages/skore/utils
__init__.py	6	0	100%
_accessor.py	7	0	100%
_environment.py	26	0	97%	29–>34
_logger.py	21	4	84%	14–18
_patch.py	11	5	46%	19–35
_progress_bar.py	30	0	100%
_show_versions.py	31	0	100%
TOTAL	2590	353	86%

Tests	Skipped	Failures	Errors	Time
542	3 💤	0 ❌	0 🔥	54.155s ⏱️

[github-actions]

Documentation preview @ 872e7e6

[auguste-probabl]

Great, thanks!