vim: Fix visual line yank on newline char (#28005)

Problem:
When yanking in visual line on the newline char, the next line gets
yanked as well:


https://github.com/user-attachments/assets/40f332dd-19f5-445f-a30f-39d50167c46f

Changes:
Similar to visual delete, exclude the newline char from the selection in
line mode.

Release Notes:

- vim: Fixed visual line yank while on the newline character yanking
following line

crates/vim/test_data/test_visual_yank.json

@@ -34,3 +34,9 @@
 {"Key":"shift-y"}
 {"Get":{"state":"The quick brown\nˇfox jumps over\nthe lazy dog","mode":"Normal"}}
 {"ReadRegister":{"name":"\"","value":"fox jumps over\nthe lazy dog\n"}}
+{"Put":{"state":"The quick brown\nfox ˇjumps over\nthe lazy dog"}}
+{"Key":"shift-v"}
+{"Key":"shift-4"}
+{"Key":"shift-y"}
+{"Get":{"state":"The quick brown\nˇfox jumps over\nthe lazy dog","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"fox jumps over\n"}}