[Logs] Authz migration (#206576)

## Summary

Closes https://github.com/elastic/kibana/issues/206395.

As per [the
docs](https://docs.elastic.dev/kibana-dev-docs/key-concepts/security-api-authorization#api-authorization)
this route is primarily a wrapper around Saved Objects (via spaces, SOs,
and advanced settings) so we opt out of explicit security checks.

x-pack/platform/plugins/shared/logs_shared/server/routes/deprecations/migrate_log_view_settings.ts

@@ -22,7 +22,17 @@ export const initMigrateLogViewSettingsRoute = ({
   getStartServices,
 }: LogsSharedBackendLibs) => {
   framework.router.put(
-    { path: MIGRATE_LOG_VIEW_SETTINGS_URL, validate: false },
+    {
+      path: MIGRATE_LOG_VIEW_SETTINGS_URL,
+      validate: false,
+      security: {
+        authz: {
+          enabled: false,
+          reason:
+            'This API delegates security to the currently logged in user and their permissions.',
+        },
+      },
+    },
     async (context, request, response) => {
       try {
         const { elasticsearch, savedObjects } = await context.core;