Clearing Ops units tests are failing on delete scratch GDB step at Pro 2.1

[csmoore]

Several Clearing Ops units tests are failing on the delete scratch GDB step at Pro 2.1

Error:

Exception ignored in: <bound method ReferenceGrid.__del__ of <scripts.RefGrid.ReferenceGrid object at 0x00000281C924E198>>
Traceback (most recent call last):
  File "C:\Users\----\Documents\GitHub\solutions-geoprocessing-toolbox\clearing_operations\scripts\RefGrid.py", line 43, in __del__
    arcpy.Delete_management(self.scratch_workspace)
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\management.py", line 4022, in Delete
    raise e
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\management.py", line 4019, in Delete
    retval = convertArcObjectToPythonObject(gp.Delete_management(*gp_fixargs((in_data, data_type), True)))
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\geoprocessing\_base.py", line 506, in <lambda>
    return lambda *args: val(*gp_fixargs(args, True))
arcgisscripting.ExecuteError: ERROR 000601: Cannot delete C:\Users\----\AppData\Local\Temp\scratch\HXJOAH.gdb.  May be locked by another application.
Failed to execute (Delete).

Steps to Reproduce (for bugs)

1. On Pro 2.1
2. Run Units Test Driver (TestKickstartPro.bat)
3. Note Clearing Ops error (above)

Context

Your Environment

• Versions used:
  Current Dev branch
  Pro 2.1 Beta 1 (2.1.9865)
  Windows 10

[csmoore]

Recommend closing this as a duplicate of #634 - combined/added the output above with the existing issue