The addition of jruby/jruby#7145 to disallow circular
causes, will throw when `polyglot` is thrown into the mix, and stop logstash from
starting and building - any gems that use an exception to determine whether or not
to load the native gem, will trigger the code added in that commit.

This commit adds a monkey patch of `require` to rollback the circular cause exception
back to the original cause.

The addition of jruby/jruby#7145 to disallow circular
causes, will throw when `polyglot` is thrown into the mix, and stop logstash from
starting and building - any gems that use an exception to determine whether or not
to load the native gem, will trigger the code added in that commit.

This commit adds a monkey patch of `require` to rollback the circular cause exception
back to the original cause.

The addition of jruby/jruby#7145 to disallow circular
causes, will throw when `polyglot` is thrown into the mix, and stop logstash from
starting and building - any gems that use an exception to determine whether or not
to load the native gem, will trigger the code added in that commit.

This commit adds a monkey patch of `require` to rollback the circular cause exception
back to the original cause.

This commit updates the version of jruby used in Logstash to `9.3.4.0`.

* Updates the references of `jruby` from `9.2.20.1` to `9.3.4.0`
* Updates references/locations of ruby from `2.5.0` to `2.6.0`
* Updates java imports including `org.logstash.util` to be quoted
  * Without quoting the name of the import, the following error is observed in tests:
  * `java.lang.NoClassDefFoundError: org/logstash/Util (wrong name: org/logstash/util)`
  * Maybe an instance of jruby/jruby#4861
* Adds a monkey patch to `require` to resolve compatibility issue between latest `jruby` and `polyglot` gem 
  * The addition of jruby/jruby#7145 to disallow circular
causes, will throw when `polyglot` is thrown into the mix, and stop logstash from
starting and building - any gems that use an exception to determine whether or not
to load the native gem, will trigger the code added in that commit.
  * This commit adds a monkey patch of `require` to rollback the circular cause exception
back to the original cause.
* Removes the use of the deprecated `JavaClass`
* Adds additional `require time` in `generate_build_metadata`
* Rewrites a test helper to avoid potentially calling `~>` on `FalseClass`


Co-authored-by: Joao Duarte <jsvduarte@gmail.com>
Co-authored-by: João Duarte <jsvd@users.noreply.github.com>