cli/named_args: improve message for casks/formulae without taps

This just improves the messaging in the `#to_formulae_and_casks_with_taps`
method so that users have a better idea of what to try next.

Ex.

```
Error: These formulae and casks are not in any locally installed taps!

- discord
- iterm2
- visual-studio-code
- zstd

You may need to run `brew tap` to install additional taps.
```

Library/Homebrew/cli/named_args.rb

@@ -105,16 +105,30 @@ module Homebrew
 
       # Returns formulae and casks after validating that a tap is present for each of them.
       def to_formulae_and_casks_with_taps
-        to_formulae_and_casks.each do |formula_or_cask|
+        formulae_and_casks_with_taps, formulae_and_casks_without_taps =
+          to_formulae_and_casks.partition do |formula_or_cask|
             case formula_or_cask
-          when Formula
+            when Formula, Cask::Cask
-            odie "Formula #{formula_or_cask.name} is not in a tap!" unless formula_or_cask.tap
+              formula_or_cask.tap&.installed?
-          when Cask::Cask
-            odie "Cask #{formula_or_cask.token} is not in a tap!" unless formula_or_cask.tap
             else
-            raise ArgumentError, "Expected a formula or a cask: #{formula_or_cask}"
+              # TODO: Refactor methods so that Sorbet can tell that this is unreachable.
+              raise ArgumentError, "Not a formula or cask: #{formula_or_cask.class}"
             end
           end
+
+        return formulae_and_casks_with_taps if formulae_and_casks_without_taps.blank?
+
+        types = []
+        types << "formulae" if formulae_and_casks_without_taps.any?(Formula)
+        types << "casks" if formulae_and_casks_without_taps.any?(Cask::Cask)
+
+        odie <<~ERROR
+          These #{types.join(" and ")} are not in any locally installed taps!
+
+          - #{formulae_and_casks_without_taps.sort_by(&:to_s).join("\n- ")}
+
+          You may need to run `brew tap` to install additional taps.
+        ERROR
       end
 
       def to_formulae_and_casks_and_unavailable(only: parent&.only_formula_or_cask, method: nil)