* move kbn-dev-utils plugin helpers under a dedicated folder
* use getPluginSearchPaths in kbn-config & kbn-optimizer
* add a script to find plugin dependencies not migrated to TS project refs
* update docs
* add a script reporting all circular deps between plugins
based on kibana.json declaration, so it doesn't provide all the cases
* fix optimizer scan logic. removed by mistake
* revert changes. fails on CI
* remove prod depenedency on kbn/dev-utils
* remove last export
* only run plugin discovery once to speed up circular dep detection
* address comments
* address comments
* update fixtures
Co-authored-by: spalger <spalger@users.noreply.github.com>
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