* fix(s3): include directory markers in ListObjects without delimiter (#8698)
Directory key objects (zero-byte objects with keys ending in "/") created
via PutObject were omitted from ListObjects/ListObjectsV2 results when no
delimiter was specified. AWS S3 includes these as regular keys in Contents.
The issue was in doListFilerEntries: when recursing into directories in
non-delimiter mode, directory key objects were only emitted when
prefixEndsOnDelimiter was true. Added an else branch to emit them in the
general recursive case as well.
* remove issue reference from inline comment
* test: add child-under-marker and paginated listing coverage
Extend test 6 to place a child object under the directory marker
and paginate with MaxKeys=1 so the emit-then-recurse truncation
path is exercised.
* fix(test): skip directory markers in Spark temporary artifacts check
The listing check now correctly shows directory markers (keys ending
in "/") after the ListObjects fix. These 0-byte metadata objects are
not data artifacts — filter them from the listing check since the
HeadObject-based check already verifies their cleanup with a timeout.
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