Remove unused require, quote support for sqlserver, etc.

* main:
  Always separate config blocks with a CR
  Fixup tests for #52850
  Stop recommending Kredis
  Fix test failure caused by #52780
  Mention `assume_ssl` in SSL middleware.

Fix `.left_outer_joins` when multiple associations have the same child.

Fix `.left_outer_joins` when multiple associations have the same child.

* main:
  Skip solid_cable gem if skip_action_cable is set (#52919)
  Call prerecord in test parallelization
  Fix a documentation name mismatch in cookies.rb
  Revert "Assign id attributes first in Active Record attribute assignment"
  Do not populate CurrentAttributes#attributes when not using defaults
  Suppress a RuboCop offense after running `rails new` with `--devcontainer`
  Fix small typo for Solid Cable changelog [ci skip] (#52911)
  Use less queries when updating nested attributes
  Load routes in LazyRoutesSet#recognize_path
  Slim down the gem section for Solid
  Add Solid Cable (#52889)
  Fix syntax error in user.rb
  Improve Active Record Association Callbacks docs [ci skip]
  Assign id attributes first in Active Record attribute assignment
  Always separate config blocks with a CR
  Fixup tests for #52850
  Replace "healthcheck" with "health check" in documentation. [ci-skip]

Remove unused require, quote support for sqlserver, etc.