Update RE so it correctly patern matches (#266)

The Regular Expression within the KQL was causing problems and resulted in the KQL reporting false positives. This PR updates the RE so it works correctly. It was not known why the formatting of the logs changed.

Author: mrlockstar

infrastructure/modules/container-app-job/alerts.tf

@@ -15,7 +15,7 @@ resource "azurerm_monitor_scheduled_query_rules_alert" "job_failure" {
     ContainerAppSystemLogs_CL
     | where JobName_s == "${azurerm_container_app_job.this.name}"
     | where Reason_s == "ProcessExited"
-    | extend ExitCode = toint(extract(@"exit code:\\s*(\\d+)", 1, Log_s))
+    | extend ExitCode = toint(extract(@"exit code:\s*(\d+)", 1, Log_s))
     | where ExitCode != 0
   KQL
   severity       = 1