fix: Finish credential redaction that was merged unfinished (#13073)

* Squash

* Removed unused files

Not mine, someone merged that stuff in earlier.

* fix: patch redaction regressions and schema breakages

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/config/zod-schema.sensitive.ts

@@ -0,0 +1,5 @@
+import { z } from "zod";
+
+// Everything registered here will be redacted when the config is exposed,
+// e.g. sent to the dashboard
+export const sensitive = z.registry<undefined, z.ZodType>();