8311663: Additional refactoring of Locale tests to JUnit

[GoeLin]

test/jdk/java/util/Locale/Bug8135061.java
test/jdk/java/util/Locale/Bug8159420.java
test/jdk/java/util/Locale/ThaiGov.java

These three need to be resolved because
"8283698: Refactor Locale constructors used in src/test" is not in 17.
Basically I took over the head version of the test in 21, and reverted the refactored constructor call.

test/jdk/java/util/Locale/UseOldISOCodesTest.java

is not in 17. It was added by "8295232: "java.locale.useOldISOCodes" property is read lazily".
As I understand the error fixed by JDK-8295232 was introduced by closed JDK-8294667. I built
jdk20 before JDK-8295232 was pushed, this causes the test to fail.
With 17 and 20 after this change it passes. I would like to take the test to 17 to
improve testing along with this change. This would also alert us if a change breaking
this is backported.
As with the changes above I had to undo JDK-8283698.

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Issue

• JDK-8311663: Additional refactoring of Locale tests to JUnit (Sub-task - P4)

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