[jdk21u-dev] RFR: 8310923: Refactor Currency tests to use JUnit [v2]

[Goetz Lindenmaier]

> I backport this to keep the 21u test suite up-to-date. This will simplify future test backports.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into backport-GoeLin-e848d947
 - Backport e848d9471f5de86e5ac157b710cd7371f12f0024

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Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/162/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/162/files/08a30821..bd58a988

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=162&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=162&range=00-01

  Stats: 1755 lines in 148 files changed: 1248 ins; 309 del; 198 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/162.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/162/head:pull/162

PR: https://git.openjdk.org/jdk21u-dev/pull/162