rust-analyzer-unwrapped: disable broken test

Currently fails to find std lib in neovim environment so hover doesn't
contain type information needed to successfully pass the test.

pkgs/development/tools/rust/rust-analyzer/default.nix

···
   passthru = {
     updateScript = nix-update-script { };
     # FIXME: Pass overrided `rust-analyzer` once `buildRustPackage` also implements #119942
-    tests.neovim-lsp = callPackage ./test-neovim-lsp.nix { };
+    # FIXME: test script can't find rust std lib so hover doesn't return expected result
+    # https://github.com/NixOS/nixpkgs/pull/354304
+    # tests.neovim-lsp = callPackage ./test-neovim-lsp.nix { };
   };
 
   meta = with lib; {