## Summary
The `/packages` folder at the root of the Kibana repository used to
contain a lot of packages.
In the context of SKA, they have been gradually moved to various
locations:
* `src/platform/packages`
* `x-pack/platform/packages`
* `src/core/packages`
Currently, only `devOnly: true` packages are left in this folder. This
comprises libraries for CLI scripts as well as testing utilities.
With this PR, we are moving ~half of these packages under
`src/platform/packages/(private|shared)/`.
In particular, we are moving those packages that are being used from
platform and/or solutions.
Since they are `"devOnly": true`, this means they are ONLY used from
tests, cypress tests, storybook configs, ./scripts/ folders inside some
modules, or other non-prod-time logic. Nonetheless, they are effectively
referenced from platform and/or solutions code, hence I decided they
should be placed under `platform` folders.
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Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
