[ruby/rubygems] Revert "Cleaned up bundler .gem and .gemspec files in ensure block."

This reverts commit ruby/rubygems@dce4ef87bb70.

ruby/rubygems@3b62e468c3

Author: nobu

spec/bundler/commands/clean_spec.rb

@@ -934,11 +934,5 @@ def should_not_have_gems(*gems)
     bundle :clean
 
     should_have_gems "bundler-#{version}"
-  ensure
-    ["bundler-#{version}.gem", "bundler-#{version}.gemspec"].each do |filename|
-      Pathname(vendored_gems(filename)).tap do |path|
-        FileUtils.rm_rf(path.basename)
-      end
-    end
   end
 end