NAS-141170 / 25.10.4 / Revert "Add handling for STATX_CHANGE_COOKIE (#343)"

[ixhamza]

Motivation and Context

While openzfs#18573 is under review upstream, revert commit 312bdab to avoid carrying the regression in 25.10.4.

See https://ixsystems.atlassian.net/browse/NAS-141170 for details.

Description

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Quality assurance (non-breaking change which makes the code more robust against bugs)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[bugclerk]

JIRA ticket https://ixsystems.atlassian.net/browse/NAS-141170 is targeted to the following versions which have not received their corresponding PRs: 26.0.0-RC.1 or 26.04, 27.0.0-BETA.1

[bugclerk]

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