Improve pap batch deployment API response

Current :

When multiple policies are deployed using PAP batch deployment API ( policy/pap/v1/pdps/deployments/batch ), if one of the policies deployment fails, the API responds with :

Error Code :  400 Bad request 

Error Message : 
{
    "errorDetails": "\"groups\" INVALID, item has status INVALID\n  \"groups\" INVALID, item has status INVALID\n    \"group\" INVALID, item has status INVALID\n      \"deploymentSubgroups\" INVALID, item has status INVALID\n        \"group\" INVALID, item has status INVALID\n          \"policies\" INVALID, item has status INVALID\n            item \"item\" value \"null\" INVALID, null"
{color:#de350b}}
 

Expected : 

When multiple policies are deployed using PAP batch deployment API, if one of the policies deployment fails, the API should respond with details of the deployed policies and undeployed policies or state that the deployment was partially successful.