[C++] GcsFileSystem should use metadata to distinguish directory markers

[asfimport]

GcsFileSystem is using files ending with / as directory markers. As described in ARROW-14924 this does not work when one wants to avoid creating a directory named foo (or foo/) if a file named foo already exists.

Reporter: Carlos O'Ryan / @coryan
Assignee: Carlos O'Ryan / @coryan

Related issues:

• [C++] Implement generic filesystem tests for GCS (is a child of)

PRs and other links:

• GitHub Pull Request #11996

_{Note: This issue was originally created as ARROW-15114. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 11996
#11996