collab: Remove dependency on X11 (#19079)

collab: Remove dependency on X11

I'm not sure if this is the best solution (perhaps pulling
`LanguageName` into a separate `language_types` crate would be
better...?) - but it massively reduces build time / dependencies / size
and means that the collab server no longer requires X11 libraries to be
installed.

tl;dr: `telemetry_events` requires the `language` crate, and the
language crate requires a whole ton of extra stuff. Since
telemetry_events only uses `language` for a single type definition
(`LanguageName`, aka `String`), we can cut all of these out by using the
base `String` type (This doesn't seem too terrible, given that all other
telemetry fields are using basic datatypes like String as opposed to
more strongly-typed variants).


FYI the dependency tree for "why does collab need X11 libraries??" looks
like this:

```
collab
 \- telemetry_events
     \- language
         |- gpui
         |- fuzzy
         |   \- gpui
         |- git
         |   \- gpui
         |- lsp
         |   |- gpui
         |   \- release_channel
         |       \- gpui
         |- settings
         |   |- fs
         |   |   \- gpui
         |   \- gpui
         |- task
         |   \- gpui
         \- theme
             \- gpui
```

Release Notes:

- N/A

crates/telemetry_events/Cargo.toml

@@ -12,6 +12,5 @@ workspace = true
 path = "src/telemetry_events.rs"
 
 [dependencies]
-language.workspace = true
 semantic_version.workspace = true
 serde.workspace = true

crates/telemetry_events/src/telemetry_events.rs

@@ -1,6 +1,5 @@
 //! See [Telemetry in Zed](https://zed.dev/docs/telemetry) for additional information.
 
-use language::LanguageName;
 use semantic_version::SemanticVersion;
 use serde::{Deserialize, Serialize};
 use std::{fmt::Display, sync::Arc, time::Duration};
@@ -150,7 +149,7 @@ pub struct AssistantEvent {
     pub model_provider: String,
     pub response_latency: Option<Duration>,
     pub error_message: Option<String>,
-    pub language_name: Option<LanguageName>,
+    pub language_name: Option<String>,
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]