[jdk17u-dev] RFR: 8353475: Open source two Swing DefaultCaret tests

[Goetz Lindenmaier]

I backport this test change as it also goes to 17.0.17-oracle.

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Commit messages:
 - Backport e08441c03352543f800aef166afabec1dacaf4bf

Changes: https://git.openjdk.org/jdk17u-dev/pull/3583/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3583&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353475
  Stats: 134 lines in 2 files changed: 134 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3583.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3583/head:pull/3583

PR: https://git.openjdk.org/jdk17u-dev/pull/3583