Verify downloaded rust-analyzer and clang binaries by checking the artifact digest (#35642)

Release Notes:

- Added GitHub artifact digest verification for rust-analyzer and clangd
binary downloads, skipping downloads if cached binary digest is up to
date
- Added verification that cached rust-analyzer and clangd binaries are
executable, if not they are redownloaded

---------

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/languages/src/json.rs

@@ -517,6 +517,7 @@ impl LspAdapter for NodeVersionAdapter {
         Ok(Box::new(GitHubLspBinaryVersion {
             name: release.tag_name,
             url: asset.browser_download_url.clone(),
+            digest: asset.digest.clone(),
         }))
     }