exceptions: move app_layer stats to common counter

Part of making the exception policy stats counters more search
friendly.

Task #7185

etc/schema.json

@@ -4677,11 +4677,6 @@
                         "error": {
                             "type": "object",
                             "properties": {
-                                "exception_policy": {
-                                    "description":
-                                            "Consolidated stats on how many times app-layer error exception policy was applied, and which one",
-                                    "$ref": "#/$defs/exceptionPolicy"
-                                },
                                 "bittorrent-dht": {
                                     "description":
                                             "Errors encountered parsing BitTorrent DHT protocol",
@@ -6158,6 +6153,19 @@
                     },
                     "additionalProperties": false
                 },
+                "exception_policy": {
+                    "type": "object",
+                    "properties": {
+                        "app_layer": {
+                            "type": "object",
+                            "error": {
+                                "description":
+                                    "Consolidated stats on how many times app-layer error exception policy was applied, and which one",
+                                "$ref": "#/$defs/exceptionPolicy"
+                            }
+                        }
+                    }
+                },
                 "file_store": {
                     "type": "object",
                     "properties": {

src/app-layer.c

@@ -1213,7 +1213,7 @@ void AppLayerSetupCounters(void)
     /* We don't log stats counters if exception policy is `ignore`/`not set` */
     if (g_applayerparser_error_policy != EXCEPTION_POLICY_NOT_SET) {
         /* Register global counters for app layer error exception policy summary */
-        const char *eps_default_str = "app_layer.error.exception_policy.";
+        const char *eps_default_str = "exception_policy.app_layer.error.";
         for (enum ExceptionPolicy i = EXCEPTION_POLICY_NOT_SET + 1; i < EXCEPTION_POLICY_MAX; i++) {
             if (IsAppLayerErrorExceptionPolicyStatsValid(i)) {
                 snprintf(app_layer_error_eps_stats.eps_name[i],