This removes 8 runtime gem dependencies from Rails:

```
Using hitimes 1.2.3
Using timers 4.1.1
Using celluloid-essentials 0.20.5
Using celluloid-extras 0.20.5
Using celluloid-fsm 0.20.5
Using celluloid-pool 0.20.5
Using celluloid-supervision 0.20.5
Using celluloid 0.17.2
```

This fixes the case when you try to render an html you know safe and the
file is named something.html. With this commit the content of the html
won't be escaped anymore because AV won't use Raw handler and choose
Html handler instead.

[ci skip] Update doc/resource link removed by #21211

[ci skip] Add job suffix to sample's job file name

Fix `unsigned?` and `blob_or_text_column` for Enum columns in MySQL

Add ActionController:Renderers test

activerecord: allocate fewer objects

Fix user name in doc [ci skip]

Allow add_to_transaction with null transaction

titleize the model name on default submit buttons

To complement actionpack/test/controller/metal/renderers_test.rb

Replace x.times.map{} with Array.new(x){} in AD::Journey::Path::Pattern

Fix typo in test description

Updated Gemfile.lock with latest change related to sucker_punch dependency

- Followup of https://github.com/rails/rails/commit/bc194937ad6c1fa12bca73cfc05de39a97ba783d.

move CHANGELOG entry to the appropriate position [ci skip]

petabyte and exabyte numeric conversion has been added after the 5.0.0.beta1 release.
ref: 85048e90

Remove FIXME comments about the `Arel::Nodes::Quoted` [ci skip]

Remove duplicate entry for ActiveRecord::Relation#cache_key from Rails 5 release notes [ci skip]

Ensure sucker_punch < v2 is installed due to the change in public API

The former is slightly more readable, performant and has fewer method calls.

```ruby
Benchmark.ips do |x|
  x.report('times.map') { 5.times.map{} }
  x.report('Array.new') { Array.new(5){} }
  x.compare!
end
__END__
Calculating -------------------------------------
           times.map    21.188k i/100ms
           Array.new    30.449k i/100ms
-------------------------------------------------
           times.map    311.613k (± 3.5%) i/s -      1.568M
           Array.new    590.374k (± 1.2%) i/s -      2.954M

Comparison:
           Array.new:   590373.6 i/s
           times.map:   311612.8 i/s - 1.89x slower
```

The `Arel::Nodes::Quoted` was removed already.
Follow up to f916aa24.

correctly presence check of `application_record.rb` in plugin

Added support for bigdecimals in perform_later