repl: Rely on block decorations to size according to content (#15713)

We no longer have to use line height calculations now that
https://github.com/zed-industries/zed/pull/15536 is in. Blocks resize
according to their content. This fixes up some of the rendering issues
on plaintext outputs as well.

Release Notes:

- Fix repl plain text output wrapping around and covering editor text
(https://github.com/zed-industries/zed/issues/15491,
https://github.com/zed-industries/zed/issues/14855)

crates/repl/src/stdio.rs

@@ -1,4 +1,4 @@
-use crate::outputs::{ExecutionView, LineHeight};
+use crate::outputs::ExecutionView;
 use alacritty_terminal::vte::{
     ansi::{Attr, Color, NamedColor, Rgb},
     Params, ParamsIter, Parser, Perform,
@@ -7,7 +7,7 @@ use core::iter;
 use gpui::{font, prelude::*, AnyElement, StyledText, TextRun};
 use settings::Settings as _;
 use theme::ThemeSettings;
-use ui::{div, prelude::*, IntoElement, ViewContext, WindowContext};
+use ui::{div, prelude::*, IntoElement, ViewContext};
 
 /// Implements the most basic of terminal output for use by Jupyter outputs
 /// whether:
@@ -95,12 +95,6 @@ impl TerminalOutput {
     }
 }
 
-impl LineHeight for TerminalOutput {
-    fn num_lines(&self, _cx: &mut WindowContext) -> usize {
-        self.handler.buffer.lines().count().max(1)
-    }
-}
-
 #[derive(Clone, Default)]
 struct AnsiTextRun {
     len: usize,