vim: Enable % to jump between tags (#20536)

Closes #12986

Release Notes:

- Enable `%` to jump between pairs of tags

---------

Co-authored-by: Harrison <hrouillard@sfi.com.au>

crates/vim/src/test/neovim_backed_test_context.rs

@@ -162,6 +162,30 @@ impl NeovimBackedTestContext {
         }
     }
 
+    pub async fn new_html(cx: &mut gpui::TestAppContext) -> NeovimBackedTestContext {
+        #[cfg(feature = "neovim")]
+        cx.executor().allow_parking();
+        // rust stores the name of the test on the current thread.
+        // We use this to automatically name a file that will store
+        // the neovim connection's requests/responses so that we can
+        // run without neovim on CI.
+        let thread = thread::current();
+        let test_name = thread
+            .name()
+            .expect("thread is not named")
+            .split(':')
+            .last()
+            .unwrap()
+            .to_string();
+        Self {
+            cx: VimTestContext::new_html(cx).await,
+            neovim: NeovimConnection::new(test_name).await,
+
+            last_set_state: None,
+            recent_keystrokes: Default::default(),
+        }
+    }
+
     pub async fn set_shared_state(&mut self, marked_text: &str) {
         let mode = if marked_text.contains('»') {
             Mode::Visual