* first pass

* return list

* types and cleanup

* add to plugin page and add styles

* update comment

* update comment

* fix component path

* simplify error component

* simplify error struct

* fix tests

* don't export and fix string()

* update naming

* remove frontend

* introduce phantom loader

* track single error

* remove error from base

* remove unused struct

* remove unnecessary filter

* add errors endpoint

* Update set log to use id field

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

* skip adding BE plugins

* remove errs from plugin + ds list

* remove unnecessary fields

* add signature state to panels

* Fetch plugins errors

* grafana/ui component tweaks

* DS Picker - add unsigned badge

* VizPicker - add unsigned badge

* PluginSignatureBadge tweaks

* Plugins list - add signatures info box

* New datasource page - add signatures info box

* Plugin page - add signatures info box

* Fix test

* Do not show Core label in viz picker

* Update public/app/features/plugins/PluginsErrorsInfo.tsx

Co-authored-by: Torkel Ödegaard <torkel@grafana.org>

* Update public/app/features/plugins/PluginListPage.test.tsx

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* Update public/app/features/plugins/PluginListPage.tsx

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* Update public/app/features/datasources/NewDataSourcePage.tsx

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* Review comments 1

* Review comments 2

* Update public/app/features/plugins/PluginsErrorsInfo.tsx

* Update public/app/features/plugins/PluginPage.tsx

* Prettier fix

* remove stale backend code

* Docs issues fix

Co-authored-by: Will Browne <will.browne@grafana.com>
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.org>
Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>