Use zed-style shifted letters (#20254)

Release Notes:

- vim: Fixed some shortcuts to render correctly in Command

crates/vim/test_data/test_convert_to_upper_case.json

@@ -1,12 +1,12 @@
 {"Put":{"state":"a😀C«dÉ1*fˇ»\n"}}
-{"Key":"U"}
+{"Key":"shift-u"}
 {"Get":{"state":"a😀CˇDÉ1*F\n","mode":"Normal"}}
 {"Put":{"state":"abˇC\n"}}
 {"Key":"shift-v"}
-{"Key":"U"}
+{"Key":"shift-u"}
 {"Get":{"state":"ˇABC\n","mode":"Normal"}}
 {"Put":{"state":"ˇaa\nbb\ncc"}}
 {"Key":"ctrl-v"}
 {"Key":"j"}
-{"Key":"U"}
+{"Key":"shift-u"}
 {"Get":{"state":"ˇAa\nBb\ncc","mode":"Normal"}}