Closes https://github.com/zed-industries/zed/issues/54042
Part of https://github.com/zed-industries/zed/issues/9789

This binary was not found when Zed first downloads the release, and then
rerun offline on the same project.

Using a `clangd-windows-21.1.0.zip ` archive from
https://github.com/clangd/clangd/releases/tag/21.1.0

```
~/Downloads ❯ unzip -l clangd-windows-21.1.0.zip|rg clangd.exe
 46908928  08-27-2025 01:40   clangd_21.1.0/bin/clangd.exe
```

Similarly, delve releases are in
https://github.com/go-delve/delve/releases and codelldb are in
https://github.com/vadimcn/codelldb/releases

```
~/Downloads ❯ unzip -l codelldb-win32-x64.vsix|rg exe
  1014272  04-21-2026 03:05   extension/bin/codelldb-launch.exe
  4400128  04-21-2026 03:05   extension/adapter/codelldb.exe
   242176  04-14-2026 04:14   extension/lldb/bin/lldb.exe
  6272000  04-14-2026 04:14   extension/lldb/bin/lldb-server.exe
    96768  04-14-2026 01:42   extension/lldb/bin/lldb-argdumper.exe
    96768  04-14-2026 04:13   extension/lldb/lib/lldb-python/lldb/lldb-argdumper.exe
    35284  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/pygments/lexer.py
   101888  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/distlib/w64.exe
   168448  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/distlib/w64-arm.exe
    91648  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/distlib/w32.exe
   108032  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/distlib/t64.exe
   182784  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/distlib/t64-arm.exe
    97792  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/distlib/t32.exe
    12161  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/pygments/lexers/__init__.py
    74926  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/pygments/lexers/_mapping.py
    53448  04-14-2026 01:36   extension/lldb/lib/site-packages/pip/_vendor/pygments/lexers/python.py
```


Release Notes:

- Fixed offline lookup of clangd on Windows