Refs #8374 EQSANS Tests no longer leave files behind

EQSANSTransAPIv2.py, EQSANSBeamCurrentAPIv2.py, EQSANSDarkCurrentAPIv2.py, EQSANSEffAPIv2.py, EQSANSIQOutputAPIv2.py, EQSANSProcessedEffAPIv2.py and EQSANSSolidAPIv2.py have had cleanup implemented, removing all the files they leave behind.
Refs #8374 SNSPowderRedux no longer leaves files behind

Implemented cleanup in SNSPowderRedux.py, removing all the files it leaves behind.
Refs #8374 LOQAddBatch no longer leaves files behind

Implemented cleanup in LOQAddBatch.py, removing all the files it leaves behind.
Refs #8374 Diffraction_Workflow_Test no longer leaves files behind

Implemented cleanup in Diffraction_Workflow_Test.py, removing all the files it leaves behind.
Merge branch 'feature/8374_clean_up_tests' into develop