Small migration of `NewAutocomplete`.

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Co-authored-by: Jed Fox <git@jedfox.com>

Seems to build fine, will test later.

Enabling the new autocomplete for dev/preview deployments.

This will allow us to spot any more issues there might be before we
release the new autocomplete.

https://github.com/actualbudget/actual/issues/773

Further iterations on the new autocomplete.

1. Created `AccountAutocomplete`
2. Started using new autocomplete in `GenericInput` (used for notes
field)
3. Extracted common functionality between the three new autocompletes to
a generic component: `Autocomplete`