There is now multiple build WARNING output on every use of `exportAntProperties` as of 3.2.0

### Affected version

3.2.0

### Bug description

There is now WARNING output on every use of `exportAntProperties`

Because all maven properties are imported to ant tasks, all properties will get a WARNING output in the build that uses the AntRun plugin and exports properties from the Ant task.

The cause of this is a change to the logging level from the original, expected DEBUG level to its current WARNING level.

https://github.com/apache/maven-antrun-plugin/blob/629e579f40077c9e57a5af88f05f0c5b7a25600f/src/main/java/org/apache/maven/plugins/antrun/AntRunMojo.java#L465

Expected: Using the exportAntProperties with value of true should not generate WARNING output in a Maven build.
Actual: The build outputs a warning for every existing Maven property that is set.

It may be acceptable and useful to output a warning if the value of the Ant property and the value of an existing Maven property do not match as that would indicate something odd.