Remove two unused formats from Projects::TreeController#show

I think these two have been have been replaced with the `logs_tree`
endpoint

app/controllers/projects/tree_controller.rb

@@ -31,20 +31,6 @@ class Projects::TreeController < Projects::ApplicationController
         lfs_blob_ids
         @last_commit = @repository.last_commit_for_path(@commit.id, @tree.path) || @commit
       end
-
-      format.js do
-        # Disable cache so browser history works
-        no_cache_headers
-      end
-
-      format.json do
-        page_title @path.presence || _("Files"), @ref, @project.full_name
-
-        # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/38261
-        Gitlab::GitalyClient.allow_n_plus_1_calls do
-          render json: TreeSerializer.new(project: @project, repository: @repository, ref: @ref).represent(@tree)
-        end
-      end
     end
   end
 

app/serializers/tree_entity.rb

-# frozen_string_literal: true
-
-class TreeEntity < Grape::Entity
-  include RequestAwareEntity
-
-  expose :id, :path, :name, :mode
-
-  expose :icon do |tree|
-    IconsHelper.file_type_icon_class('folder', tree.mode, tree.name)
-  end
-
-  expose :url do |tree|
-    project_tree_path(request.project, File.join(request.ref, tree.path))
-  end
-end

app/serializers/tree_root_entity.rb

-# frozen_string_literal: true
-
-# TODO: Inherit from TreeEntity, when `Tree` implements `id` and `name` like `Gitlab::Git::Tree`.
-class TreeRootEntity < Grape::Entity
-  include RequestAwareEntity
-
-  expose :path
-
-  expose :trees, using: TreeEntity
-  expose :blobs, using: BlobEntity
-  expose :submodules, using: SubmoduleEntity
-
-  expose :parent_tree_url do |tree|
-    path = tree.path.sub(%r{\A/}, '')
-    next unless path.present?
-
-    path_segments = path.split('/')
-    path_segments.pop
-    parent_tree_path = path_segments.join('/')
-
-    project_tree_path(request.project, File.join(request.ref, parent_tree_path))
-  end
-
-  expose :last_commit_path do |tree|
-    logs_file_project_ref_path(request.project, request.ref, tree.path)
-  end
-end

app/serializers/tree_serializer.rb

-# frozen_string_literal: true
-
-class TreeSerializer < BaseSerializer
-  entity TreeRootEntity
-end