chore(skore-local-project): Fix typings

[thomass-dev]

Prerequisite for #2069.

python -m mypy --config-file=skore-local-project/pyproject.toml skore-local-project/                                                                                                                                                    

skore-local-project/src/skore_local_project/metadata.py:17: error: Module "skore" has no attribute "CrossValidationReport"  [attr-defined]
skore-local-project/src/skore_local_project/metadata.py:17: error: Module "skore" has no attribute "EstimatorReport"  [attr-defined]
skore-local-project/src/skore_local_project/metadata.py:31: error: Module "skore" has no attribute "CrossValidationReport"  [attr-defined]
skore-local-project/src/skore_local_project/metadata.py:31: error: Module "skore" has no attribute "EstimatorReport"  [attr-defined]
skore-local-project/src/skore_local_project/project.py:22: error: Module "skore" has no attribute "CrossValidationReport"  [attr-defined]
skore-local-project/src/skore_local_project/project.py:22: error: Module "skore" has no attribute "EstimatorReport"  [attr-defined]
skore-local-project/src/skore_local_project/project.py:206: error: Module "skore" has no attribute "CrossValidationReport"  [attr-defined]
skore-local-project/src/skore_local_project/project.py:206: error: Module "skore" has no attribute "EstimatorReport"  [attr-defined]

[github-actions]

Coverage Report for skore-local-project/

File	Stmts	Miss	Cover	Missing
skore-local-project/src/skore_local_project
__init__.py	5	0	100%
metadata.py	87	4	95%	26, 38, 150–151
project.py	102	1	99%	244
storage.py	40	2	95%	45, 187
TOTAL	234	7	97%

Tests	Skipped	Failures	Errors	Time
24	0 💤	0 ❌	0 🔥	7.185s ⏱️