fix: Select item when allowNewOptions is true and Enter is pressed

[michael-s-molina]

SUMMARY

Follow up of #15363.
Fixes the bug: When allowNewOptions is true and Enter is pressed, the item is not being selected.

@rusackas @geido

TESTING INSTRUCTIONS

1 - Open the Select storybook
2 - Go to "Interactive Select"
3 - Enable allowNewOptions
4 - Type an unknown value and press Enter
5 - The value should be created and checked

ADDITIONAL INFORMATION

• Has associated issue:
• 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

[geido]

LGTM!

[codecov]

Codecov Report

Merging #15429 (cf721de) into master (d8a1acf) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #15429      +/-   ##
==========================================
- Coverage   77.23%   77.22%   -0.02%     
==========================================
  Files         975      975              
  Lines       50653    50659       +6     
  Branches     6223     6228       +5     
==========================================
- Hits        39124    39121       -3     
- Misses      11318    11327       +9     
  Partials      211      211              

Flag	Coverage Δ
javascript	71.70% <0.00%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
superset-frontend/src/components/Select/Select.tsx	0.00% <0.00%> (ø)
...rBar/CascadeFilters/CascadeFilterControl/index.tsx	90.00% <0.00%> (-2.31%)	⬇️
...Filters/FilterBar/FilterControls/FilterControl.tsx	100.00% <0.00%> (ø)
.../FilterBar/CascadeFilters/CascadePopover/index.tsx	62.31% <0.00%> (+0.55%)	⬆️

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