Tidy up test cleancommand

• Start to restructure test clean targets

• Fix restarting test and ensure test_name set

• Remove CLEANCOMMAND and use targets instead to specify extra files for tests to clean up

• Ensure we remove all created files

Moves list of shared files to remove from tests to tests/Makefile.tests_common and renames to CLEAN_TEST_FILES

Renames clean to clean_individual_test in tests/Makefile.tests_common to give better information about what this targets.

Adds clean_local_test target in test specific Makefiles as preferred approach to add test specific files to remove.