Make date/time converter TCK tests locale-data tolerant

[robertpatrick]

Fixes #2187

This updates the Faces TCK converter tests to avoid brittle expectations when running on newer JDKs with updated locale data.

Changes:

• Generate the Dutch localized date/time input and expected output values with DateTimeFormatter, using the same locale and format styles exercised by the tests.
• Replace legacy PST timezone usage in the old DateTimeConverter test with America/Los_Angeles.

This fixes JDK 25 failures in:

• Issue4087IT#testJavaTimeTypes
• Issue4110IT#testLocalDateTime

Verification:

• Ran the two affected converter tests against WebLogic with JDK 25 using the updated TCK artifacts.
• Result: 2 tests run, 0 failures, 0 errors, 0 skipped.

[dmatej]

Is the Dutch locale preinstalled on all standard environments? I remember times when ie. Solaris had just a few and user had to install more manually.

It is just a question, I agree to merge this + cherrypick to older versions. I have seen failures of these tests many times.