Adding support to pass config variable in the publish cmd as a flag. More info b/330606878

[deepgoel17]

Support config variable as parametes of integrationcli CLI

Goal: avoid override of config variable value in the config variable file in cicd pipeline

[deepgoel17]

cmd sample:

integrationcli integrations versions publish -p standalone-ip-prod-testing -r us-east1 -t $(gcloud auth print-access-token) -n deep-config-var-cli-test --config-vars-json '{"`CONFIG_emial`":"[email protected]"}' -s 1 --api autopush