feat(getA11yStatusMessage): simplify the a11y message in hooks

[silviuaavram]

What:

Why: Closes https://github.com/downshift-js/downshift/issues/1244. Closes https://github.com/downshift-js/downshift/issues/1227 Closes https://github.com/downshift-js/downshift/issues/1322

How:

Checklist:

• [x] Documentation
• [x] Tests
• [x] TypeScript Types
• [ ] Flow Types
• [x] Ready to be merged

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (v9@f79c593). Click here to learn what that means.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## v9 #1579 +/- ## ====================================== Coverage ? 100.00% ====================================== Files ? 18 Lines ? 1729 Branches ? 520 ====================================== Hits ? 1729 Misses ? 0 Partials ? 0 ```

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