Bug: upload gdb already exists in AGOL

[jacobdadams]

Today AGOL had issues, which meant that the publish from gdb step failed during a skid. All future attempts then failed because the gdb already existed. Need to check if it exists/remove it first.

[jacobdadams]

#85 helps by allowing clients to assign a name to the uploaded gdb, giving them the ability to check if it exists before starting a delete or truncate-and-load process.