* started converting tests to junit5
* replaced TempFolder with JUnit TempDir
* migrated some test classes to JUnit5
* migrated a parameterized testclass to junit5
* Update core/pom.xml
Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>
* replaced junit4 with junit5-vintage engine
Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>