There were a number of areas within the Search Plugin where typings
could have been improved, namely:
- The `customProps` sent to the `ReindexButton`. This now uses the
`satisfies` keyword to ensure type strictness.
- The `collectionLabels` prop sent to the `ReindexButtonClient`
component. This is now standardized behind a new
`ResolvedCollectionLabels` type to closely reflect `CollectionLabels`.
This was also converted from unnecessarily invoking a function to being
a basic object.
- The `locale` type sent through `SyncDocArgs`. This now uses
`Locale['code']` from Payload.
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