removed command ping

.azure-pipelines/callGithubWorkflow.yaml

@@ -71,7 +71,6 @@ jobs:
           $token = $githubToken | ConvertTo-SecureString -AsPlainText -Force
           $pullRequestNumberInt = [int]$pullRequestNumber
           $client_payload = @{
-              "command" = "ping"
               "pullRequestBranchName" = "$branchName"
               "pullRequestNumber" = $pullRequestNumberInt
           }
@@ -86,7 +85,7 @@ jobs:
           $Parameters = @{
               Method      = "POST"
               Uri         = "https://api.github.com/repos/Azure/Azure-Sentinel/dispatches"
-              Headers     = $Header
+              Headers     = $header
               ContentType = "application/json"
               Body        = $jsonBody
               Authentication = "Bearer"