Form select field is not navigable by typing the first letter of an option

[jarekdanielak]

Describe the bug

In Forms, the select field is not fully navigable by keyboard. You can't choose an option by starting to type it.

Steps to reproduce

1. Create new form with Select field with several options.
2. Open Select field in preview and try to type the first letter of some option.
3. Selected option doesn't change.

Expected behavior

Select field is fully navigable by keyboard. You can open it by tabbing into it and select options either by arrow keys or by typing the first letter.

Environment

Seems to be the same even on very old Camunda Modeler versions, back to v5.10.

Additional context

Related to SUPPORT-24389

Support ticket also mentioned that form doesn't use full screen width now, which I wasn't able to reproduce in Camunda Modeler.