Currently, in the Korean locale (`ko`), the `CupertinoDatePicker`
displays the time in the order of `hour : minute : AM/PM`.
However, the correct format for Korean conventions is `AM/PM : hour :
minute`.
This PR modifies the `CupertinoDatePicker` to display the time in the
correct order when the Korean locale is used.
## Changes
- Updated the time display order for the Korean (`ko`) locale in
`CupertinoDatePicker`.
- Previous format: `hour : minute : AM/PM`
- Updated format: `AM/PM : hour : minute`
## Pre-launch Checklist
- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
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