[M114] Set WebAuthenticationJSONSerialization status to "test"

This feature interferes with some internal code and should not be
enabled in experimental-web-platform-features until that is resolved.

(cherry picked from commit f08e3d1)

Bug: 1439567
Change-Id: I690084acd8f6cac31b58fde765ef4564434d0b6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4491244
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Auto-Submit: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1137309}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4492319
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5735@{#75}
Cr-Branched-From: 2f562e4-refs/heads/main@{#1135570}

Author: kreichgauer

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -3693,7 +3693,7 @@
     // https://w3c.github.io/webauthn/#sctn-parseRequestOptionsFromJSON
     {
       name: "WebAuthenticationJSONSerialization",
-      status: "experimental",
+      status: "test",
     },
     {
       name: "WebAuthenticationLargeBlobExtension",