Fix TestGroup warning due to missing tags

[pcd1193182]

Motivation and Context

Warning: TestGroup '/home/pcd/zfs/tests/zfs-tests/tests/functional/syncfs' not added to
this run. Auxiliary script '/home/pcd/zfs/tests/zfs-tests/tests/functional/syncfs/setup' failed
verification.

Description

Add the missing tags to the runfile section for syncfs

How Has This Been Tested?

Ran the test suite, verified that the group no longer gets excluded

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.

[robn]

Urgh yeah, removed no-op setup/cleanup late in #17420; I felt like I had them there for a reason. Made a note to make the runfile stuff understand it next time I'm touring ZTS.

Thanks @pcd1193182.