HDDS-13738. Discovered 2 'junit-platform.properties' configuration files

[echonesis]

What changes were proposed in this pull request?

Exclude junit-platform.properties from test-jar artifacts to prevent duplicate configuration file warnings during test execution.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-13738

How was this patch tested?

• GitHub Actions CI: https://github.com/echonesis/ozone/actions/runs/21936401797
• Local Check

> mvn clean install -DskipTests -DskipShade

> jar tf ~/.m2/repository/org/apache/ozone/ozone-manager/2.2.0-SNAPSHOT/ozone-manager-2.2.0-SNAPSHOT-tests.jar | grep junit-platform.properties

> ls hadoop-ozone/ozone-manager/target/test-classes/junit-platform.properties
hadoop-ozone/ozone-manager/target/test-classes/junit-platform.properties