offline-tests: fail on comparison in offline-tests (#2095)

Two main problems fixed here:
- offline tests will fail on a comparison failure (a mistake from the
re-write)
- art-group-info is committed to the repo and shared with every thread
(running the tests with 1 thread, for example on the CI, and locally
were producing different results)

art files are still not provided to the jak2 offline tests:
- `*-ag` files are not being output
- `art-elts.gc` is not complete, as a handful of files claim to be
missing stuff

lastly, in jak1's offline tests we were also running `tpage` and `*-vis`
files through the decompiler. This omits that (they came from the
`all_objs.json` file) -- is this an issue?

decompiler/main.cpp

@@ -19,6 +19,7 @@
 #include "decompiler/level_extractor/extract_level.h"
 
 #include "third-party/CLI11.hpp"
+#include "third-party/json.hpp"
 
 int main(int argc, char** argv) {
   ArgumentGuard u8_guard(argc, argv);
@@ -179,6 +180,14 @@ int main(int argc, char** argv) {
   // process art groups (used in decompilation)
   if (config.decompile_code || config.process_art_groups) {
     db.extract_art_info();
+    // dumb art info to json if requested
+    if (config.dump_art_group_info) {
+      auto file_name = out_folder / "dump" / "art-group-info.min.json";
+      nlohmann::json json = db.dts.art_group_info;
+      file_util::create_dir_if_needed_for_file(file_name);
+      file_util::write_text_file(file_name, json.dump(-1));
+      lg::info("[DUMP] Dumped art group info to {}", file_name.string());
+    }
   }
 
   // main decompile.