Move the deprecation call after the new class has been defined:

- If we create the deprecation before the new class is defined this
  creates an issue in case you use a `TracePoint`. The
  `Tracepoint#return_value` will try to get the new class constant
  resulting in a uninitialized constant Rails::SourceAnnotationExtractor

  The problem can be reproduced like this:

  ```ruby
  @defined = Set.new

  ANONYMOUS_CLASS_DEFINITION_TRACEPOINT = TracePoint.new(:c_return) do |tp|
    next unless @defined.add?(tp.return_value)
  end

  ANONYMOUS_CLASS_DEFINITION_TRACEPOINT.enable

  require 'rails'
  require "rails/source_annotation_extractor"
  ```

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