[MNG-6825] Replace FileUtils with Commons IO

[timtebeek]

For: https://issues.apache.org/jira/browse/MNG-6825

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[timtebeek]

This PR was largely created through: https://github.com/timtebeek/maven-rewrite/blob/main/file-utils.yml

It's not yet a complete migration, as a few cases need dedicated recipes, or manual work to convert completely, depending on how much they are used.

[elharo]

Failure looks flaky and unrelated:

Error: Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:3.0.0:check (checkstyle-check) on project core-its: Execution checkstyle-check of goal org.apache.maven.plugins:maven-checkstyle-plugin:3.0.0:check failed: Plugin org.apache.maven.plugins:maven-checkstyle-plugin:3.0.0 or one of its dependencies could not be resolved: Could not transfer artifact org.apache.maven:maven-artifact:jar:3.0 from/to central (https://repo.maven.apache.org/maven2): transfer failed for https://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact/3.0/maven-artifact-3.0.jar: Connect to repo.maven.apache.org:443 [repo.maven.apache.org/146.75.28.215] failed: Connection timed out

[gnodet]

Could we just switch to the nio api which provides a bunch of helper methods ? I'd rather remove dependencies than adding one....

[michael-o]

Could we just switch to the nio api which provides a bunch of helper methods ? I'd rather remove dependencies than adding one....

I think yes, with a little bit of effort.

[elharo]

Not everything in this PR is covered by NIO in Java 8. As of Java 11 though we should be able to remove most uses of Apache Commons IO too.