fix(ComboBox): update Enter key handling

[adamalston]

Closes #18728

Fixed ComboBox Enter key handling.

Changelog

Changed

• Fixed ComboBox Enter key handling.

Testing / Reviewing

yarn test packages/react/src/components/ComboBox

A test story can be created by copying and pasting this code in ComboBox.stories.js:

export const _test = (args) => {
  const [invalidText, setInvalidText] = useState('');

  return (
    <div style={{ width: 300 }}>
      <ComboBox
        helperText="Combobox helper text"
        id="carbon-combobox"
        itemToString={(item) => item?.text ?? ''}
        invalid={!!invalidText}
        invalidText={invalidText}
        items={[
          { id: 'option-1', text: 'Option 1' },
          { id: 'option-2', text: 'Option 2' },
          { id: 'option-3', text: 'Option 3' },
        ]}
        onChange={({ selectedItem }) => {
          setInvalidText(selectedItem?.id === 'option-1' ? 'Invalid' : '');
        }}
        onToggleClick={() => {}}
        titleText="ComboBox title"
      />
    </div>
  );
};

Reference commits: 448a2b7...3fbba63

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[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.36%. Comparing base (448a2b7) to head (381edb2).
Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
...ackages/react/src/components/ComboBox/ComboBox.tsx	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18737      +/-   ##
==========================================
+ Coverage   84.34%   84.36%   +0.02%     
==========================================
  Files         408      408              
  Lines       14645    14640       -5     
  Branches     4771     4821      +50     
==========================================
- Hits        12352    12351       -1     
+ Misses       2132     2127       -5     
- Partials      161      162       +1     

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[heloiselui]

Looks good Adam!