ICU-23101 Add extended year test for Chinese, Gregorian, Japanese, ...

[sffc]

Added test for the extended year. I can also add tests for other things.

Checklist

• [x] Required: Issue filed: ICU-23101
• [x] Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• [x] Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• [ ] Issue accepted (done by Technical Committee after discussion)
• [x] Tests included, if applicable
• [ ] API docs and/or User Guide docs changed or added, if applicable

[FrankYFTang]

Could we also add the same test to Java if a C++ test is needed.

[jira-pull-request-webhook[bot]]

Notice: the branch changed across the force-push!

• icu4j/main/core/src/test/java/com/ibm/icu/dev/test/calendar/CalendarRegressionTest.java is now changed in the branch

View Diff Across Force-Push

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