viewer: change auth for whoami and capabilities handlers (#17942)

Author: StekPerepolnen

ydb/core/viewer/viewer.cpp

@@ -82,6 +82,24 @@ class TViewer : public TActorBootstrapped<TViewer>, public IViewer {
                 .ActorId = ctx.SelfID,
                 .UseAuth = false,
             });
+            mon->RegisterActorPage({
+                .RelPath = "viewer/json/capabilities", // temporary handling of old paths
+                .ActorSystem = ctx.ActorSystem(),
+                .ActorId = ctx.SelfID,
+                .UseAuth = false,
+            });
+            mon->RegisterActorPage({
+                .RelPath = "viewer/whoami",
+                .ActorSystem = ctx.ActorSystem(),
+                .ActorId = ctx.SelfID,
+                .UseAuth = false,
+            });
+            mon->RegisterActorPage({
+                .RelPath = "viewer/json/whoami", // temporary handling of old paths
+                .ActorSystem = ctx.ActorSystem(),
+                .ActorId = ctx.SelfID,
+                .UseAuth = false,
+            });
             mon->RegisterActorPage({
                 .Title = "Viewer",
                 .RelPath = "viewer/v2",