Require our dependency and forgo the core ext version.

- Only Action Cable README did not have this section, all of the other
  READMEs have this section.

- Remove "Configuration", "Running the server", "Dependencies" and "Deployment"
  sections from the Action Cable README as they are already duplicated in the
  Action Cable overview guide.

[Javan Makhmali, Jon Moss]

Cuts down the number of concurrent Sauce Labs VMs we need to spin up. Can add specific versions back in to target regressions if need be.

Added 'sh' for markdown formatting as bash.

Sorry, forgot to include in my main PR :(

[ci skip]

[Jon Moss, Zach Schneider]

Allow failures until test runs are consistently stable, not hanging.

Closes #24943.
Signed-off-by: NJeremy Daer <jeremydaer@gmail.com>

Introduced in d6f2000a and was only used by Action Cable. Now handled by Action Cable’s assets:compile task.

Apps that depend on Action Cable don't need Blade for app development,
so we can remove the gem dependency.

We do need Blade for Action Cable dev, so we bundle it in the Gemfile.
Signed-off-by: NJeremy Daer <jeremydaer@gmail.com>

[ci skip]

Other generated files do keep to this, but action cable doesn't.

Method description improved to reflect little bit more complicated scenario when names are camel-cased.

Cable: Generate .js or .coffee files while generating channel as per the javascript engine of the application

- Now we will detect what javascript engine user is using and based on
  that we will generate either `.js` or `.coffee` version of the channel
  file.
- This also needs a change in coffee-rails to override the `js_template`
  method. Related PR https://github.com/rails/coffee-rails/pull/72.
- Currently coffee-rails gem sets
  `config.app_generators.javascript_engine` to `:coffee` and using this
  information we override the `js_template` to set the extension as
  `.coffee` in coffee-rails gem.
- Using this approach, we can keep the `channel.js` and `channel.coffee`
  files in the Rails repository itself.
- Additionally the `js_template` method can act as public interface for
  coffee-rails gem to hook into and change the extension to `.coffee`
  without maintaining the actual asset files.

[Prathamesh Sonpatki, Matthew Draper]

Signed-off-by: NJeremy Daer <jeremydaer@gmail.com>

In #23935, cable file was to be provided by the javascript instead of coffeescript,
doc was also been modified to use javascript.

[ci skip]

This is an engine living in action_cable/engine.rb, convention is to
call these things *::Engine.

Looking at thi git history looks like the current *::Railtie was just
an accident.

default worker pool size was changed from 100 to 4 at #24376

* Use separate stream handler builders for easy override and testing.
* Fix worker pool execution that was silently failing since it only
  expected connection receivers.

Sparked by code in #24162.