Fixes https://github.com/elastic/kibana/issues/145129
In order to make our TS setup in the repo far more efficient we needed
to make it a little more complicated than it used to be. This includes a
few rules that all tsconfig files need to follow which were currently
assumed to be true, but with this PR will now be validated:
1. No tsconfig.json files are allowed to extend the `tsconfig.json`
file. This file is used to produce types for the root of the repo, and
include the `package.json` file in a project so it can be referenced in
projects directly. Files which violate this rule were updated to point
to the root `tsconfig.base.json` file.
2. Every tsconfig.json file must extend the `tsconfig.base.json` file,
either directly or indirectly.
Changes files components (`FileUpload`, `FilePicker`) so that
their API returns the whole `fileJSON` instead of just and `id` (and
`kind`)
This is needed, for example, in image emebeddable to also get an
blurHash after uploading or picking an image without fetching the whole
file again.
* implement copy updates
* move rename file and update empty state copy
* update title to respect multi select vs single select
* added test for single select behaviour
* implement single select behaviour
* introduce and use multiple prop, default true
* pass multiple flag to state
* pass multiple upload flag to UI
* added single select story
* update files example to still support multiple select
* uploadMultiple -> selectMultiple
* remove use of non-existent i18n
* update filepicker react component tests
