fix: avoid displaying manifest contents (close #568)

In most apps, the amount of output alone makes this less useful.

Users can manually check `ViteRuby.instance.manifest` when debugging.

Author: ElMassimo

vite_ruby/lib/vite_ruby/missing_entrypoint_error.rb

@@ -16,7 +16,6 @@ def initialize(file_name:, last_build:, manifest:, config:)
       #{possible_causes(last_build)}
       :troubleshooting:
       #{"Manifest files found:\n#{config.manifest_paths.map { |path| "  #{path.relative_path_from(config.root)}" }.join("\n")}\n" if last_build.success}
-      #{"Content in your manifests:\n#{JSON.pretty_generate(manifest)}\n" if last_build.success}
       #{"Last build in #{config.mode} mode:\n#{last_build.to_json}\n" if last_build.success}
     MSG
   end