[typescript-migration] test/calendar_test.test.js and test/datepicker_test.test.js

[yuki0410-dev]

name: Migrate test/calendar_test.test.js and test/datepicker_test.test.js

Description

Linked issue: #4700

Changes test/calendar_test.test.js and test/datepicker_test.test.js were 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 96.72%. Comparing base (abed5ac) to head (e3af74c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4855 +/- ## ========================================== - Coverage 96.72% 96.72% -0.01% ========================================== Files 28 28 Lines 2991 2990 -1 Branches 1284 1286 +2 ========================================== - Hits 2893 2892 -1 Misses 98 98 ```

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[martijnrusschen]

You can merge with the latest master to reduce the changes in this PR

[yuki0410-dev]

@martijnrusschen Rebased!