Plax should include CLI options to flag specific tests as skip

[GregArtieschoufsky]

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 .