Revert "FEATURE: Allow theme tests to be run in production (#12815)" (#12840)

This reverts commit 7217dcb67a59f9c47d655455b60b4e1d8dc30f28.

https://meta.discourse.org/t/failed-to-bootstrap-due-to-out-of-memory-killer/188141/18?u=osama

Precompiling test_helper.js is so expensive that it can make bootstrap
fail on servers with limited resources (2GB RAM). We will find another
way that doesn't require much resources.

app/controllers/theme_javascripts_controller.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 class ThemeJavascriptsController < ApplicationController
   DISK_CACHE_PATH = "#{Rails.root}/tmp/javascript-cache"
-  TESTS_DISK_CACHE_PATH = "#{Rails.root}/tmp/javascript-cache/tests"
 
   skip_before_action(
     :check_xhr,
@@ -12,7 +11,7 @@ class ThemeJavascriptsController < ApplicationController
     only: [:show, :show_tests]
   )
 
-  before_action :is_asset_path, :no_cookies, :apply_cdn_headers, only: [:show, :show_tests]
+  before_action :is_asset_path, :no_cookies, :apply_cdn_headers, only: [:show]
 
   def show
     raise Discourse::NotFound unless last_modified.present?
@@ -36,26 +35,26 @@ class ThemeJavascriptsController < ApplicationController
   end
 
   def show_tests
-    digest = params[:digest]
-    raise Discourse::NotFound if !digest.match?(/^\h{40}$/)
+    raise Discourse::NotFound if Rails.env.production?
 
-    theme = Theme.find_by(id: params[:theme_id])
-    raise Discourse::NotFound if theme.blank?
+    theme_id = params.require(:theme_id)
+    theme = Theme.find(theme_id)
+    content = ThemeField
+      .where(
+        theme_id: theme_id,
+        target_id: Theme.targets[:tests_js]
+      )
+      .each(&:ensure_baked!)
+      .map(&:value_baked)
+      .join("\n")
 
-    content, content_digest = theme.baked_js_tests_with_digest
-    raise Discourse::NotFound if content.blank? || content_digest != digest
+    ThemeJavascriptCompiler.force_default_settings(content, theme)
 
-    @cache_file = "#{TESTS_DISK_CACHE_PATH}/#{digest}.js"
-    return render body: nil, status: 304 if not_modified?
+    response.headers["Content-Length"] = content.size.to_s
+    response.headers["Last-Modified"] = Time.zone.now.httpdate
+    immutable_for(1.second)
 
-    if !File.exist?(@cache_file)
-      FileUtils.mkdir_p(TESTS_DISK_CACHE_PATH)
-      File.write(@cache_file, content)
-    end
-
-    response.headers["Content-Length"] = File.size(@cache_file).to_s
-    set_cache_control_headers
-    send_file(@cache_file, disposition: :inline)
+    send_data content, filename: "js-tests-theme-#{theme_id}.js", disposition: :inline
   end
 
   private
@@ -65,13 +64,7 @@ class ThemeJavascriptsController < ApplicationController
   end
 
   def last_modified
-    @last_modified ||= begin
-      if params[:action].to_s == "show_tests"
-        File.exist?(@cache_file) ? File.ctime(@cache_file) : nil
-      else
-        query.pluck_first(:updated_at)
-      end
-    end
+    @last_modified ||= query.pluck_first(:updated_at)
   end
 
   def not_modified?