Make clear button focusable for select

[martha]

Description

GH issue: https://github.com/open-path/Green-River/issues/7004, specifically https://github.com/open-path/hmis-accessibility/issues/37

This doesn't address all a11y issues with MUI's Autocomplete component; see issue description on 37 for additional topics to discuss.

Type of change

• Bug fix
• New feature (adds functionality)
• Code clean-up / housekeeping
• Dependency update
• Accessibility update

Checklist before requesting review

• I have performed a self-review of my code
• I have run the code that is being changed under ideal conditions, and it doesn't fail
• My code includes comments and/or descriptive variable names to help other engineers understand the intent (or not applicable)
• My code follows the style guidelines of this project (eslint)
• I have updated the documentation (or not applicable)
• If it's not obvious how to test this change, I have provided testing instructions in this PR or the related issue

[gigxz]

looks good!