* Allocate multiple flaky test runner agents as executions grow
* WIP support for deleting kibana install dir during CI
* Add setup script for testing scripts
* Add REMOVE_KIBANA_INSTALL_DIR=1 to flaky test runner
* Change flaky test runner worker processes from 8 to 12
* add serverMocha config for flaky job
* fix typo
* no reason to setup everything over and over, just call scripts/mocha
* force CI_GROUP param for testing
* define local CI_GROUP_PARAM that can be assigned alternate values temporarily
* add additional metadata to job description
* add workerNumber param to worker block
* use kibanaPipeline.getPostBuildWorker to define wrapper function
* use kibanaPipeline specific bash function
* revert changes made for debugging
* Revert "Revert "Add pipeline for flaky test runner job (#46740)""
This reverts commit 7d96a13fad.
Also reconcile changes to Jenkinsfile since original revert happened
* Fix param parsing and add missed change
* Add missing variable
