Add file extension to react-dates import

[connor-baer]

Purpose

Some fixes that I found while testing the latest next prerelease.

Approach and changes

• Add file extensions to imports of react-dates/initialize. This is a file import, so under ESM, it needs to have a file extension (Migrate packages to ESM #2061)
• Deduplicate the START_DATE and END_DATE constants (Migrate packages to ESM #2061)
• Replace deprecated Badge variants in Storybook components (Remove deprecated props #2063)

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[changeset-bot]

🦋 Changeset detected

Latest commit: 16e11ff

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sumup/circuit-ui	Patch

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Name	Status	Preview	Updated (UTC)
oss-circuit-ui	✅ Ready (Inspect)	Visit Preview	May 2, 2023 11:07am

[codecov]

Codecov Report

Merging #2079 (16e11ff) into next (f1b72a4) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             next    #2079      +/-   ##
==========================================
- Coverage   96.92%   96.91%   -0.01%     
==========================================
  Files         258      258              
  Lines       23166    23163       -3     
  Branches     2165     2165              
==========================================
- Hits        22453    22449       -4     
  Misses        707      707              
- Partials        6        7       +1     

Impacted Files	Coverage Δ
...t-ui/components/Calendar/RangePickerController.tsx	51.42% <0.00%> (ø)
...ges/circuit-ui/components/Calendar/RangePicker.tsx	88.23% <100.00%> (ø)
...circuit-ui/components/Calendar/SingleDayPicker.tsx	100.00% <100.00%> (ø)
.../circuit-ui/components/CalendarTag/CalendarTag.tsx	54.41% <100.00%> (-5.45%)	⬇️
...mponents/CalendarTagTwoStep/CalendarTagTwoStep.tsx	53.64% <100.00%> (+2.61%)	⬆️