Search for executable names

Please allow search for executable names.

> First time me hearing about `hpack-dhall-cabal` and there is no such package: https://hackage.haskell.org/package/hpack-dhall-cabal.
> SOURCE: https://github.com/haskell/cabal/pull/9984#discussion_r2874421957

No results found for https://hackage.haskell.org/packages/search?terms=hpack-dhall-cabal

> [!NOTE]
> No results found for https://hackage.haskell.org/packages/search?terms=dhall-hpack-cabal either[^1], the name of the exe.
> [^1]: I'd made a typo the first time.

In this instance, this is an executable in the [hpack-dhall](https://hackage.haskell.org/package/hpack-dhall-0.5.7/hpack-dhall.cabal) package.

```cabal
...
name: hpack-dhall
...
executable dhall-hpack-cabal
...
```