DEV: removes unused intergation.rake (#28687)

This is dead code which won't even run.

lib/tasks/integration.rake

@@ -1,48 +0,0 @@
-# frozen_string_literal: true
-
-require "open-uri"
-
-desc "Creates the integration fixtures. Requires a development instance running."
-task "integration:create_fixtures" => :environment do
-  fixtures = {
-    discovery: %w[/latest.json /categories.json /c/bug/l/latest.json],
-    topic: ["/t/280.json"],
-    user: %w[/u/eviltrout.json /user_actions.json /topics/created-by/eviltrout.json],
-    static: %w[/faq /tos /privacy],
-    unknown: ["/404-body"],
-  }
-
-  fixtures.each do |type, urls|
-    filename = "#{Rails.root}/test/javascripts/fixtures/#{type}_fixtures.js"
-
-    content = "export default {\n"
-    urls.each do |url|
-      http_result = fake_xhr("http://localhost:3000#{url}")
-
-      # If the result is not JSON, convert it to JSON
-      begin
-        parsed = ::JSON.parse(http_result)
-      rescue StandardError
-        http_result = http_result.to_json
-      end
-      content << "\"#{url}\": #{http_result},\n"
-    end
-    content << "};\n"
-
-    File.write(filename, content)
-  end
-end
-
-def fake_xhr(url)
-  uri = URI(url)
-
-  result = nil
-  Net::HTTP.start(uri.host, uri.port) do |http|
-    request = Net::HTTP::Get.new uri
-    request.add_field "X-Requested-With", "XMLHttpRequest"
-    response = http.request(request)
-    result = response.body.force_encoding("UTF-8")
-  end
-
-  result
-end