Reproducer for MNG-8720

Note the symlink foo

• Run mvn validate (or similar) in projects/clientA/foo/bar (= full path)
  ➡️ no warning message is produced

• Run same command from foo/bar (= symlinked path)
  ➡️ warning Project root directory and multiModuleProjectDirectory are not aligned in the output

Tested with Maven 4.0.0-rc-3