chore: Clippy fixes for 1.80 (#13987)

The biggest hurdle turned out to be use of `Arc<Language>` in maps, as
`clippy::mutable_key_type` started triggering on it (due to - I suppose
- internal mutability on `HighlightMap`?). I switched over to using
`LanguageId` as the key type in some of the callsites, as that's what
`Language` uses anyways for it's hash/eq, though I've still had to
suppress the lint outside of language crate.

/cc @maxdeviant , le clippy guru.

Release Notes:

- N/A

crates/gpui/src/text_system.rs

@@ -658,26 +658,6 @@ impl Hash for RenderGlyphParams {
     }
 }
 
-/// The parameters for rendering an emoji glyph.
-#[derive(Clone, Debug, PartialEq)]
-pub struct RenderEmojiParams {
-    pub(crate) font_id: FontId,
-    pub(crate) glyph_id: GlyphId,
-    pub(crate) font_size: Pixels,
-    pub(crate) scale_factor: f32,
-}
-
-impl Eq for RenderEmojiParams {}
-
-impl Hash for RenderEmojiParams {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        self.font_id.0.hash(state);
-        self.glyph_id.0.hash(state);
-        self.font_size.0.to_bits().hash(state);
-        self.scale_factor.to_bits().hash(state);
-    }
-}
-
 /// The configuration details for identifying a specific font.
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
 pub struct Font {