fix: forwardRef warnings in selects

[michael-s-molina]

SUMMARY

Fixes the following warning in selects:

Warning: forwardRef render functions do not support propTypes or defaultProps. 
Did you accidentally pass a React component?

No logic was changed. I just moved forwardRef as part of the const declaration before exporting it so the linter can understand the reference.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #20970 (0317bfa) into master (eb5369f) will increase coverage by 0.00%.
The diff coverage is 85.00%.

❗ Current head 0317bfa differs from pull request most recent head 440f80b. Consider uploading reports for the commit 440f80b to get more accurate results

@@           Coverage Diff           @@
##           master   #20970   +/-   ##
=======================================
  Coverage   66.38%   66.38%           
=======================================
  Files        1767     1767           
  Lines       67232    67235    +3     
  Branches     7138     7140    +2     
=======================================
+ Hits        44633    44636    +3     
  Misses      20773    20773           
  Partials     1826     1826           

Flag	Coverage Δ
javascript	52.11% <85.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../src/components/Select/WindowedSelect/windowed.tsx	72.72% <80.00%> (+2.72%)	⬆️
...set-frontend/src/components/Select/AsyncSelect.tsx	83.26% <81.63%> (+0.07%)	⬆️
superset-frontend/src/components/Select/Select.tsx	87.16% <90.75%> (+0.08%)	⬆️

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[geido]

Hey Michael. Thanks for the improvement. LGTM!