Converting tests to junit5 (#4699)

* 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>