[I] [C++] Fix GCS filesystem getFileInfo method. [arrow]

[via GitHub]

HyunWooZZ opened a new issue, #46414:
URL: https://github.com/apache/arrow/issues/46414

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   Describe the bug, including details regarding any error messages, version, 
and platform.
   Originate from this issue.
   https://github.com/apache/iceberg-python/issues/1952
   
   Basically it hava to return origin info which is not found error,  however 
that code return directory type.
   
https://github.com/apache/arrow/blob/5240670813a2dac6386eb854f060384a3db946d1/cpp/src/arrow/filesystem/gcsfs.cc#L341
   ```cpp
       std::string canonical = internal::EnsureTrailingSlash(path.object);
       auto list_result = client_.ListObjects(path.bucket, 
gcs::Prefix(canonical));
       if (list_result.begin() != list_result.end()) {
         // If there is at least one result it indicates this is a directory (at
         // least one object exists that starts with "path/")
         return FileInfo(path.full_path, FileType::Directory);
       }
   ```
   
   
   Steps to reproduce:
   I make the same logic to get the result:)
   Without any gc account setting. Run the below code.
   ```cpp
   
   #include "google/cloud/storage/client.h"
   #include <iostream>
   #include <stdexcept>
   
   namespace gcs = ::google::cloud::storage;
   
   int main(int argc, char* argv[]) {
       if (argc != 2) {
           std::cerr << "Usage: " << argv[0] << " <bucket-name>\n";
           return 1;
       }
   
       std::string bucket_name = argv[1];
   
       auto client = gcs::Client();
   
       auto list_result = client.ListObjects(bucket_name);
   
       auto begin = list_result.begin();
       auto end = list_result.end();
   
       if (begin != end) {
           std::cout << "Objects found in bucket: " << bucket_name << "\n";
       } else {
           std::cout << "No objects found in bucket: " << bucket_name << "\n";
       }
       return 0;
   }
   ```
   
   it printed "Objects found in bucket:  some bucket."
   
   Component(s)
   C++
   
   
   
   ### Component(s)
   
   C++


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