DEV: Upgrading Discourse to Zeitwerk (#8098)

Zeitwerk simplifies working with dependencies in dev and makes it easier reloading class chains. 

We no longer need to use Rails "require_dependency" anywhere and instead can just use standard 
Ruby patterns to require files.

This is a far reaching change and we expect some followups here.

lib/freedom_patches/zeitwerk.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+module ActiveSupport::Dependencies::ZeitwerkIntegration::Inflector
+  CUSTOM_PATHS = {
+    'base' => 'Jobs',
+    'canonical_url' => 'CanonicalURL',
+    'clean_up_unmatched_ips' => 'CleanUpUnmatchedIPs',
+    'homepage_constraint' => 'HomePageConstraint',
+    'ip_addr' => 'IPAddr',
+    'onpdiff' => 'ONPDiff',
+    'onceoff' => 'Jobs',
+    'pop3_polling_enabled_setting_validator' => 'POP3PollingEnabledSettingValidator',
+    'postgresql_fallback_adapter' => 'PostgreSQLFallbackHandler',
+    'regular' => 'Jobs',
+    'scheduled' => 'Jobs',
+    'source_url' => 'SourceURL',
+    'topic_query_sql' => 'TopicQuerySQL',
+    'version' => 'Discourse',
+  }
+
+  def self.camelize(basename, _abspath)
+    return basename.camelize if _abspath =~ /onceoff\.rb$/
+    CUSTOM_PATHS.fetch(basename, basename.camelize)
+  end
+end