Plax should include CLI options to flag specific tests as skip

My understanding of the current Plax implementation of "skip" is that the flag is assigned to individual tests in the flat files (.yaml). However, the AAP microservice has a need for the feature of assigning "skip" to individual tests at the command line.

We would like to run a command like the following in CICD:
`plaxrun -run plaxrun.yaml -dir plax -g sad-path -I ./dht-plax-common-code -skip some-test -log debug -redact -json | jq .`