Jn/gcp discovery improvements

[kickroot]

Resolves PROD-8046
Resolves PROD-8041

Big Query:

 {
  "documentId" : "iQttP-XsPbGWGhNHVPk8Jw",
  "assetId" : "//bigquery.googleapis.com/projects/oss-discovery-test/datasets/oss_test_dataset",
  "resourceName" : "oss_test_dataset",
  "resourceId" : "//bigquery.googleapis.com/projects/oss-discovery-test/datasets/oss_test_dataset",
  "resourceType" : "GCP::BigQuery::Dataset",
...
}

Big Table:

 {
  "documentId" : "80tldNGTPUyMnk0LxhVs9w",
  "assetId" : "//bigtable.googleapis.com/projects/jason-758682/instances/jason-test-instance",
  "resourceName" : "jason-test-instance",
  "resourceId" : "//bigtable.googleapis.com/projects/jason-758682/instances/jason-test-instance",
  "resourceType" : "GCP::BigTable::Instance",
...
}

CloudSQL:

{
  "documentId" : "9hNMc5IdOtCsOGErA6OD8w",
  "assetId" : "//sqladmin.googleapis.com/projects/test-targets-347030/instances/cloud-sql-psql-inst",
  "resourceName" : "cloud-sql-psql-inst",
  "resourceId" : "//sqladmin.googleapis.com/projects/test-targets-347030/instances/cloud-sql-psql-inst",
  "resourceType" : "GCP::SQL::Instance",
  "region" : "us-west1",
...
}