Add JRuby 9.4 to test matrix

[TonyCTHsu]

What does this PR do?

1. Add JRuby 9.4 into our matrix
2. Disable action cable test that are causing log writing failed. closed stream in CircleCI.

Motivation:

Increase coverage

Additional Notes:

Our test suite was running into RuntimeError: class variable access from toplevel, I can reproduce it from the test suite but not from the below script.

I downgraded to activerecord 6.1 and activerecord-jdbc-adapter 61.0 to mitigate the failure temporarily.

puts RUBY_DESCRIPTION

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'activerecord', '~> 7.0.0'
  gem "activerecord-jdbc-adapter", "~> 70.0", platform: :jruby
end

require 'activerecord-jdbc-adapter'

ActiveRecord::Base.establish_connection("mysql2://root:root@mysql:3306/mysql")

ActiveRecord::Base.connection

How to test the change?

Green CI

[ivoanjo]

All hail JRuby :D

[ivoanjo]

Btw you may want to rebase on https://github.com/DataDog/dd-trace-rb/pull/3753 to pick up the libdatadog 10 upgrade. Sorry for the extra work :pray:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.90%. Comparing base (f0e28ec) to head (beb5284).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3752   +/-   ##
=======================================
  Coverage   97.90%   97.90%           
=======================================
  Files        1237     1237           
  Lines       74200    74260   +60     
  Branches     3598     3598           
=======================================
+ Hits        72645    72705   +60     
  Misses       1555     1555           

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