fix: DropdownContainer items width calculation

[michael-s-molina]

SUMMARY

Updates DropdownContainer to correctly calculate the width of the items when the items property changes.
Previously, the width calculation was only considering visible items which lead to resizing errors.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Screen.Recording.2022-12-08.at.9.24.46.AM.mov

Screen.Recording.2022-12-08.at.9.21.49.AM.mov

TESTING INSTRUCTIONS

Check the videos for instructions.

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

[kgabryje]

Works great!

[codecov]

Codecov Report

Merging #22371 (9a79dbe) into master (f64423a) will decrease coverage by 0.00%.
The diff coverage is 33.33%.

❗ Current head 9a79dbe differs from pull request most recent head ef12db6. Consider uploading reports for the commit ef12db6 to get more accurate results

@@            Coverage Diff             @@
##           master   #22371      +/-   ##
==========================================
- Coverage   66.87%   66.86%   -0.01%     
==========================================
  Files        1847     1847              
  Lines       70561    70559       -2     
  Branches     7739     7739              
==========================================
- Hits        47186    47178       -8     
- Misses      21374    21381       +7     
+ Partials     2001     2000       -1     

Flag	Coverage Δ
javascript	53.82% <33.33%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
...rontend/src/components/DropdownContainer/index.tsx	64.55% <33.33%> (-8.29%)	⬇️

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[codyml]

Worked locally for me, LGTM!