Use parent process name signature for Caldera Implant

[RomuDeuxfois]

Description

For the OpenBAS implant we create just one signature: EXPECTATION_SIGNATURE_TYPE_PARENT_PROCESS_NAME.
And for Caldera implant we create multiple signatures depending on the payload type (command line, drop file, ect).

We currently have detection issues with a caldera implant and Crowdstrike collector. So we need to use EXPECTATION_SIGNATURE_TYPE_PARENT_PROCESS_NAME for Caldera Implant as well.

[jborozco]

Not critical but to put to master in case we do a minor

[savacano28]

@damgouj This issue could be fixed after #1860?