[jdk17u-dev] RFR: 8353585: Provide ChoiceFormat#parse(String, ParsePosition) tests

[Goetz Lindenmaier]

I backport this for parity with 17.0.18-oracle.

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Commit messages:
 - Backport fd2734e97d3ef505473938109746ae59d5fefca6

Changes: https://git.openjdk.org/jdk17u-dev/pull/3908/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3908&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353585
  Stats: 76 lines in 1 file changed: 76 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3908.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3908/head:pull/3908

PR: https://git.openjdk.org/jdk17u-dev/pull/3908