Check return values of raft-ann-bench subprocess calls

[benfred]

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>.

[cjnolet]

/merge