Check return values of raft-ann-bench subprocess calls

The python raft-ann-bench code launches subprocesses to execute C++ code.
These scripts weren't checking the return values of the C++ programs though,
and just waiting for them to finish.  Fix this to propogate the failures up
as exceptions by checking the subprocess return value.

After this change, having a failing subprocess looks something like:

```
2023-10-12 10:54:55 [info] Using the dataset file '/home/ben/code/raft/python/raft-ann-bench/datasets/glove-100-inner/base.fbin'
terminate called after throwing an instance of 'std::runtime_error'
  what():  read header of BinFile failed: /home/ben/code/raft/python/raft-ann-bench/datasets/glove-100-inner/base.fbin
Traceback (most recent call last):
  File "/home/ben/code/raft/python/raft-ann-bench/src/raft-ann-bench/run/__main__.py", line 324, in <module>
    main()
  File "/home/ben/code/raft/python/raft-ann-bench/src/raft-ann-bench/run/__main__.py", line 309, in main
    run_build_and_search(
  File "/home/ben/code/raft/python/raft-ann-bench/src/raft-ann-bench/run/__main__.py", line 113, in run_build_and_search
    subprocess.run(cmd, check=True)
  File "/home/ben/miniconda3/envs/raft/lib/python3.10/subprocess.py", line 526, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/home/ben/miniconda3/envs/raft/bin/ann/RAFT_CAGRA_ANN_BENCH', '--build', '--data_prefix=/home/ben/code/raft/python/raft-ann-bench/datasets/', '--benchmark_out_format=json', '--benchmark_out=/home/ben/code/raft/python/raft-ann-bench/datasets/glove-100-inner/result/build/raft_cagra-10-10000.json', '/home/ben/code/raft/python/raft-ann-bench/src/raft-ann-bench/run/conf/temporary_glove-100-inner.json']' died with <Signals.SIGABRT: 6>.
```

python/raft-ann-bench/src/raft-ann-bench/get_dataset/__main__.py

@@ -36,12 +36,13 @@ def convert_hdf5_to_fbin(path, normalize):
     ann_bench_scripts_path = os.path.join(scripts_path, "hdf5_to_fbin.py")
     print(f"calling script {ann_bench_scripts_path}")
     if normalize and "angular" in path:
-        p = subprocess.Popen(
-            ["python", ann_bench_scripts_path, "-n", "%s" % path]
+        subprocess.run(
+            ["python", ann_bench_scripts_path, "-n", "%s" % path], check=True
         )
     else:
-        p = subprocess.Popen(["python", ann_bench_scripts_path, "%s" % path])
-    p.wait()
+        subprocess.run(
+            ["python", ann_bench_scripts_path, "%s" % path], check=True
+        )
 
 
 def move(name, ann_bench_data_path):

python/raft-ann-bench/src/raft-ann-bench/run/__main__.py

@@ -110,9 +110,7 @@ def run_build_and_search(
             if force:
                 cmd = cmd + ["--overwrite"]
             cmd = cmd + [temp_conf_filepath]
-            print(cmd)
-            p = subprocess.Popen(cmd)
-            p.wait()
+            subprocess.run(cmd, check=True)
 
         if search:
             search_folder = os.path.join(legacy_result_folder, "search")
@@ -132,9 +130,7 @@ def run_build_and_search(
             if force:
                 cmd = cmd + ["--overwrite"]
             cmd = cmd + [temp_conf_filepath]
-            print(cmd)
-            p = subprocess.Popen(cmd)
-            p.wait()
+            subprocess.run(cmd, check=True)
 
         os.remove(temp_conf_filepath)
 

python/raft-ann-bench/src/raft-ann-bench/split_groundtruth/__main__.py

@@ -23,10 +23,10 @@ def split_groundtruth(groundtruth_filepath):
     pwd = os.getcwd()
     os.chdir("/".join(groundtruth_filepath.split("/")[:-1]))
     groundtruth_filename = groundtruth_filepath.split("/")[-1]
-    p = subprocess.Popen(
-        [ann_bench_scripts_path, groundtruth_filename, "groundtruth"]
+    subprocess.run(
+        [ann_bench_scripts_path, groundtruth_filename, "groundtruth"],
+        check=True,
     )
-    p.wait()
     os.chdir(pwd)