Pre-commit: exclude mypy for all tests (#6639)

Not worth to have strict type check by mypy for tests/* . Keeping a static type checker still would improve readability, but it also increases the development time, especially for tests that goes the expected path of the logic. Lose up on readability for tests can speed up development time.

.pre-commit-config.yaml

@@ -90,6 +90,7 @@ repos:
         .docker/.*|
         docs/.*|
         utils/.*|
+        tests/.*|
 
         src/aiida/calculations/arithmetic/add.py|
         src/aiida/calculations/diff_tutorial/calculations.py|
@@ -192,17 +193,6 @@ repos:
         src/aiida/transports/plugins/local.py|
         src/aiida/transports/plugins/ssh.py|
         src/aiida/workflows/arithmetic/multiply_add.py|
-
-        tests/conftest.py|
-        tests/repository/conftest.py|
-        tests/repository/test_repository.py|
-        tests/sphinxext/sources/workchain/conf.py|
-        tests/sphinxext/sources/workchain_broken/conf.py|
-        tests/storage/psql_dos/migrations/conftest.py|
-        tests/storage/psql_dos/migrations/django_branch/test_0026_0027_traj_data.py|
-        tests/test_calculation_node.py|
-        tests/test_nodes.py|
-
       )$
 
   - id: dm-generate-all