Merge branch 'master' into habtm

* master:
  we can define callbacks without a builder instance
  push methods that don't depend on the instance to the class
  get the name from the reflection
  cache the name and options on the stack
  decouple belongs_to callback definition from the builder instance.
  add_before_destroy_callbacks doesn't depend on the instance, so push it to the class.
  valid_options doesn't depend on the instance, so push it to the class
  use the information on the reflection to determine whether callbacks should be added
  Running all isolated test for actionview
  association builder is no longer needed for counter cache, so remove it
  push constructable? on to the reflection
  Adds the Rails maintenance policy to the Guides
  name is on the reflection, so just use the reflection
  decouple define_callback from the instance
  Added activemodel as a explicit dependency
  unify `Fixes` notes in AR changelog. [ci skip].
  improving `reload` doc wording. #12418 [ci skip]
  Update AR reload doc for the case of manually set primary key attribute [ci skip]

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