git: openjdk/jdk-sandbox: json: Add exception msg tests for unescaped key in obj. Correct InternalError to JPE for incorrect unescaped U sequence

[duke]

Changeset: ba912de8
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-03-13 13:15:57 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/ba912de8d9fbba7af4eb937554f69dac91ea1e5e

Add exception msg tests for unescaped key in obj. Correct InternalError to JPE for incorrect unescaped U sequence

! src/java.base/share/classes/java/util/json/JsonParser.java
! test/jdk/java/util/json/TestParseException.java