RFR: JDK-8331646: Add specific regression leap year tests (Task - P4)

[Roger Riggs]

On Fri, 3 May 2024 10:31:14 GMT, serhiysachkov <duke at openjdk.org> wrote:

> Calendar.add() tests that describe its behavior.

The bug report and/or the PR description should describe the change in more detail.
What conditions of the Calendar spec are being tested.  Thanks

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PR Comment: https://git.openjdk.org/jdk/pull/19082#issuecomment-2096482166