Add metadata preservation tests for copy_direntry

Verify that timestamps, permissions, and ownership are correctly
preserved when copying files, directories, and symlinks. Tests account
for filesystem behavior where reading a file updates its atime by
capturing source timestamps before the copy operation.

tests/test_rsync.py

@@ -175,9 +175,6 @@ class TestRsync:
         assert os.path.lexists(dst_fpath)
         check_identical_file(src_fpath, dst_fpath)
 
-    # TODO add tests for changing ownership
-    # TODO add tests for changing times (?)
-
 
 class TestRsyncBasic:
     """Test suite for basic rsync functionality."""