fix(select): use KeyboardEvent.key instead of KeyboardEvent.keyCode for auto-completion

[feloy]

Fixes #11294.

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• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
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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?

Issue Number: #11294

What is the new behavior?

KeyboardEvent.key is used instead of KeyboardEvent.keyCode when getting the key pressed, for auto-completion.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[Splaktar]

LGTM