[jdk21u-dev] RFR: 8353585: Provide ChoiceFormat#parse(String, ParsePosition) tests

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

-------------

Commit messages:
 - Backport fd2734e97d3ef505473938109746ae59d5fefca6

Changes: https://git.openjdk.org/jdk21u-dev/pull/2190/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2190&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/jdk21u-dev/pull/2190.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2190/head:pull/2190

PR: https://git.openjdk.org/jdk21u-dev/pull/2190