fix(autocomplete): announce when an item is selected from the dropdown

[Splaktar]

PR Checklist

Please check that your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
• Docs have been added, updated, or were not required

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

When selecting an item from the dropdown, screen readers do not notify the user that a selection was made.

Issue Number:
Fixes #10837

What is the new behavior?

• announce when an item is selected from the dropdown
• make sure that this message can be overridden in non-English locales
• fix some lint warnings and style issues
• add and fix JSDoc

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information