Revert "metrics: Enable OOBE pre-consent metrics feature flag."

This reverts commit 49519dff4c.

Reason for revert: 
Suspect causing FirstUserOobeMetricsTest.ClientIdReset to fail
on `linux-chromeos-chrome`.

First red build:
https://ci.chromium.org/ui/p/chrome/builders/ci/linux-chromeos-chrome/49282/overview

Original change's description:
> metrics: Enable OOBE pre-consent metrics feature flag.
>
> BUG=b:369205818
>
> Change-Id: I862cd5df118658f3c1ee9332bd2b0d9bbb871274
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6287405
> Commit-Queue: Troy Wang <troywang@google.com>
> Reviewed-by: Jong Ahn <jongahn@chromium.org>
> Reviewed-by: Simon Ziegltrum <ziegltrum@google.com>
> Cr-Commit-Position: refs/heads/main@{#1426587}

Bug: b:369205818
Change-Id: I32942baf746494bb846bc0bcdb7363819ae89ce3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6314720
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Xiyuan Xia <xiyuan@chromium.org>
Owners-Override: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1426691}

ash/constants/ash_features.cc

@@ -2044,7 +2044,7 @@ BASE_FEATURE(kOobePersonalizedOnboarding,
 // If enabled, Pre-consent metrics functionality is enabled during OOBE.
 BASE_FEATURE(kOobePreConsentMetrics,
              "OobePreConsentMetrics",
-             base::FEATURE_ENABLED_BY_DEFAULT);
+             base::FEATURE_DISABLED_BY_DEFAULT);
 
 // If enabled, Consumer Software Screen will be shown during OOBE.
 BASE_FEATURE(kOobeSoftwareUpdate,