[EuiSuggest] keyboard navigation issues

[alexwizp]

During real-world testing of this component, we found a couple of keyboard issues that should probably be addressed on the component side

• We should keep focus on input component after selecting something from the suggestions list.
  test case:
  1. start typing to open a list of suggestions
  2. press Tab to select first item from the list
  3. press Enter to apply suggestion.
  4. continue typing

Expected behavior: Focus should be on Input control. User should be able to continue typing

• In case of no suggestions we need don't need to set focus on empty list
  1. fill control with text without suggestions
  2. press Tab button

Expected behavior: Focus should be on next form control. It's probably true, but if I select somewhere in form focus returned back to EuiSuggest.

[thompsongl]

#4302 and #3733 discuss this more completely, but we are tracking that EuiSuggest will be refactored in the future.

[ryankeairns]

FYI, the EuiSuggest component is being used in this PR, so this issue resurfaced.

[github-actions]

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