<i18n dev> RFR: 8331851: Add specific regression leap year tests for Calendar.roll()

[serhiysachkov]

Add specific regression tests for Calendar.roll() method to explicitly various leap year test scenarios. This is inspired by the ambiguity which occurred in leap year unaware test creation as in case with Calendar.add() in swing component test case as detailed in (https://bugs.openjdk.org/browse/JDK-8327088).

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Commit messages:
 - JDK-8331851 Add specific regression leap year tests for Calendar.roll()

Changes: https://git.openjdk.org/jdk/pull/19247/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19247&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331851
  Stats: 190 lines in 1 file changed: 190 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19247.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19247/head:pull/19247

PR: https://git.openjdk.org/jdk/pull/19247