Update redirection files to reflect the new arrangement

Redirections for Advanced Threat Analytics and those for Defender for Identity are now in their own files.

Author: garycentric

.openpublishing.publish.config.json

@@ -185,11 +185,12 @@
   "branch_target_mapping": {},
   "targets": {},
   "redirection_files": [
-    ".openpublishing.redirection.ata-atp.json",
+    ".openpublishing.redirection.ata.json",
     ".openpublishing.redirection.defender.json",
     ".openpublishing.redirection-defender-business.json",
     ".openpublishing.redirection.defender-cloud-apps.json",
     ".openpublishing.redirection.defender-endpoint.json",
+    ".openpublishing.redirection.defender-identity.json",
     ".openpublishing.redirection.defender-office-365.json",
     ".openpublishing.redirection.defender-xdr.json",
     ".openpublishing.redirection.unified-secops.json"