* Validate current node version (#19154)
* feat(12976): node version validation at runtime.
* refact(12976): move the code into a static utilities class.
* test(12976): added first test case using jest.
* test(12976): added test cases for node_version.
* feat(12976): create setup env node to bootstrap babel, ts-node and node version validator.
* refact(12976): migrated node version code from es6 to es5.
* feat(12976): node version validation at runtime.
* refact(12976): move the code into a static utilities class.
* test(12976): added first test case using jest.
* test(12976): added test cases for node_version.
* feat(12976): create setup env node to bootstrap babel, ts-node and node version validator.
* refact(12976): migrated node version code from es6 to es5.
* fix(12976): remove one level from ts node register cache directory link.
* chore(12976): added caret to semver dependecy in order to support minor versions.
* refact(12976): small change from named import to default import on node version validator.
* refact(12976): removed ts_node_register and add the code to babel_register.
* feat(12976): split eslint config in order to properly support files built to run before and after node version validator. refact(12976): convert script files to es5 code. refact(12976): delete inline eslint configs from node version check related files.
* refact(12976): remove ts node register file.
* refact(12976): completely port setup_node_env to es5.
* refact(12976): remove babel_register invokation from external dependencies in scripts.
* refact(12976): move node_version code directly into node_version_validator inside setup_node_env folder.
* refact(12976): only node version validator for kbn script.
* Fix check_file_casing babel_register reference (#19457)
* chore(12976): fixed license headers on new files.
* [mocha] use custom reporter for legible results in jenkins
* [jest] use custom result processor for legible results in jenkins
* [karma] enable junit output on CI
* [mocha/junitReporter] accept rootDirectory as configuration
* [jest/reporter] use reporters option added in jest 20
* [toolingLog] remove black/white specific colors
* [dev/mocha/junit] no reason for junit to be a "reporter"
* typos
* [dev/mocha/junit] use else if
* [karma/junit] use string#replace for explicitness
* [junit] use test file path as "classname"
* [ftr/mocha] no longer a "console" specific reporter
* [babel] create babel-preset and babel-register modules
* [babel-preset] add comments to babel-preset-env.target choices
* [babel-preset] use more normal BUILT_WITH_BABEL signal
* [babel-register] extended comment about filtering ./src in dist
* [babel-preset] stage of class properties has changed, sorta
(cherry picked from commit 48d35f81fd)
