Handle empty directories with content-type application/octet-stream also as directories

[imjalpreet]

Description

Certain systems create empty directories with content-type as application/octet-stream rather than application/x-directory due to which we see failures when trying to create an external table on top of such directories as Presto does not recognize them as directories.

Motivation and Context

Fixes #20310

Impact

This PR will allow Presto to recognize such directories

Test Plan

Tested the fix with Minio.
Before this fix, got the below error while trying to create an external table with the location as an empty directory in Minio

presto:imjalpreet_db> create table imjalpreet_content_type(a int, b int) WITH (external_location='s3a://imjalpreet-minio/imjalpreet-content-type/');
Query 20230818_102509_00006_8ppz6 failed: External location must be a directory

After the fix, create table ran successfully on the same empty directory:

presto:imjalpreet_db> create table imjalpreet_content_type(a int, b int) WITH (external_location='s3a://imjalpreet-minio/imjalpreet-content-type/');
CREATE TABLE

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Release Notes

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== RELEASE NOTES ==

Hive Changes
* Handle empty directories with content-type application/octet-stream also as directories (:issue:`20310`)

[kiersten-stokes]

Tested and confirmed that this fixes the issue - LGTM!

[imjalpreet]

Thank you @tdcmeehan and @kiersten-stokes for reviewing the PR. I will go ahead and merge.