Replace react-autocomplete (#1263)

## Summary
- switch InputAutocomplete to `downshift`
- remove obsolete `react-autocomplete` dependency
- document autocomplete change in the changelog

## Testing
- `npm run lint`
- `npm run build`


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https://chatgpt.com/codex/tasks/task_e_68685a78c2d483319c068f813723c1a7

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/components/FieldSourceLayer.tsx

@@ -29,7 +29,6 @@ class FieldSourceLayerInternal extends React.Component<FieldSourceLayerInternalP
       error={this.props.error}
     >
       <InputAutocomplete
-        keepMenuWithinWindowBounds={!!this.props.isFixed}
         value={this.props.value}
         onChange={this.props.onChange}
         options={this.props.sourceLayerIds?.map(l => [l, l])}