Remove json-diff crate

- It can be stuck in infinite loops
- Slow on complex JSON files

check-submodule.py

@@ -20,8 +20,7 @@ To compute metrics on a continuous integration system:
 To compare metrics and retrieve the structural JSON of differences
 in addition to the files containing the minimal tests:
 
-1. Install json-diff from here: https://github.com/Luni-4/json-diff/releases
-2. Install json-minimal-tests from here: https://github.com/Luni-4/json-minimal-tests/releases
+1. Install json-minimal-tests from here: https://github.com/Luni-4/json-minimal-tests/releases
 
 ./check-submodule.py compare-metrics -l TREE_SITTER_LANGUAGE
 
@@ -203,13 +202,7 @@ def compare_metrics(args: argparse.Namespace) -> None:
     # Create compare directory
     compare_dir.mkdir(parents=True, exist_ok=True)
 
-    # Get JSON of differences
-    print("\nSave JSON of differences in", compare_dir)
-    run_subprocess(
-        "json-structural-diff-cli", "--raw-json", "-o", compare_dir, old_dir, new_dir
-    )
-
-    # Get minimal tests
+    # Get JSON differences and minimal tests
     print("\nSave minimal tests in", compare_dir)
     run_subprocess("json-minimal-tests", "-o", compare_dir, old_dir, new_dir)
 

check-submodules.sh

@@ -20,12 +20,6 @@ if [ "$RUN_CI" = "no" ]; then
     exit 0
 fi
 
-# Install json-diff
-JSD_LINK="https://github.com/Luni-4/json-structural-diff/releases/download"
-JSD_VERSION="0.1.0"
-curl -L "$JSD_LINK/v$JSD_VERSION/json-structural-diff-linux.tar.gz" |
-tar xz -C $CARGO_HOME/bin
-
 # Install json minimal tests
 JMT_LINK="https://github.com/Luni-4/json-minimal-tests/releases/download"
 JMT_VERSION="0.1.1"