fix: Allow ComboBox to accept the FocusableRef for ref

[mofojed]

• Wasn't allowing a ref to be passed in to ComboBox

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 46.58%. Comparing base (115e057) to head (4dc0cfc).

Files	Patch %	Lines
...ages/components/src/spectrum/comboBox/ComboBox.tsx	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2121 +/- ## ========================================== - Coverage 46.59% 46.58% -0.01% ========================================== Files 681 681 Lines 38430 38431 +1 Branches 9576 9786 +210 ========================================== Hits 17905 17905 + Misses 20515 20474 -41 - Partials 10 52 +42 ``` | [Flag](https://app.codecov.io/gh/deephaven/web-client-ui/pull/2121/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deephaven) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/deephaven/web-client-ui/pull/2121/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deephaven) | `46.58% <0.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deephaven#carryforward-flags-in-the-pull-request-comment) to find out more.

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