Avoid including check-jsonschema in test dependencies

Run check-jsonschema using uv tool in order to decouple it from
our own test environment.

See: python-jsonschema/check-jsonschema#259

Author: ssbarnea

.config/requirements-test.txt

@@ -1,7 +1,6 @@
 ansi2html >= 1.8.0
 ansible-lint >= 6.12.1
 black
-check-jsonschema
 coverage[toml]
 docker >= 7.1.0 # testing
 filelock >= 3.9.0

tests/unit/model/v2/test_schema.py

@@ -37,6 +37,9 @@ def test_molecule_schema(resources_folder_path: Path) -> None:
     """
     app = get_app(Path())
     cmd = [
+        "uv",
+        "tool",
+        "run",
         "check-jsonschema",
         "-v",
         "--schemafile",