languages: Allow installing pre-release of rust-analyzer and clangd (#37530)

Release Notes:

- Added lsp binary config to allow fetching nightly rust-analyzer and
clangd releases

crates/project/src/lsp_store.rs

@@ -13070,6 +13070,7 @@ impl LspAdapter for SshLspAdapter {
     async fn fetch_latest_server_version(
         &self,
         _: &dyn LspAdapterDelegate,
+        _: &AsyncApp,
     ) -> Result<Box<dyn 'static + Send + Any>> {
         anyhow::bail!("SshLspAdapter does not support fetch_latest_server_version")
     }

crates/project/src/project_settings.rs

@@ -516,6 +516,12 @@ pub struct BinarySettings {
     pub ignore_system_version: Option<bool>,
 }
 
+#[derive(Clone, Debug, Default, Serialize, Deserialize, PartialEq, Eq, JsonSchema, Hash)]
+pub struct FetchSettings {
+    // Whether to consider pre-releases for fetching
+    pub pre_release: Option<bool>,
+}
+
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema, Hash)]
 #[serde(rename_all = "snake_case")]
 pub struct LspSettings {
@@ -527,6 +533,7 @@ pub struct LspSettings {
     /// Default: true
     #[serde(default = "default_true")]
     pub enable_lsp_tasks: bool,
+    pub fetch: Option<FetchSettings>,
 }
 
 impl Default for LspSettings {
@@ -536,6 +543,7 @@ impl Default for LspSettings {
             initialization_options: None,
             settings: None,
             enable_lsp_tasks: true,
+            fetch: None,
         }
     }
 }