[typescript-migration] month_year_dropdown.jsx and month_year_dropdown_options.jsx

[yuki0410-dev]

name: Migrate month_year_dropdown.jsx and month_year_dropdown_options.jsx

Description

Linked issue: #4700

Changes month_year_dropdown.jsx and month_year_dropdown_options.jsx was migrated to ts

Contribution checklist

• [x] I have followed the contributing guidelines.
• [x] I have added sufficient test coverage for my changes.
• [x] I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.03%. Comparing base (1606cf3) to head (522102e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4724 +/- ## ========================================== - Coverage 97.16% 97.03% -0.14% ========================================== Files 18 16 -2 Lines 1765 1686 -79 Branches 742 735 -7 ========================================== - Hits 1715 1636 -79 Misses 50 50 ```

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