Revert "telemetry: extend networking info with IPv6 and other fields"

This reverts commit 21cd9690e135ead341fb000d405f26e39618f3a1.

Reason for revert: NetworkTelemetrySamplerTest are broken
crbug.com/411343738

Bug: 327532834
Original change's description:
> telemetry: extend networking info with IPv6 and other fields
>
> There is a request to extend the networking info in such a way that it
> the Telemetry API can provide the following information in addition to
> already provided one - 1) IPv6 addresses + gateway 2) Whether the
> connection is metered 3) max download link speed
>
> Design doc -
> https://docs.google.com/document/d/1JEKN9_WEV0PEVabQHE7GsXaKQk5UjGyhcVDJDS_4b4E
>
> Bug: 327532834
> Change-Id: I5837c2b87b909c5e399b769c40f1ccffdfd2e46c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6450338
> Reviewed-by: Leonid Baraz <lbaraz@chromium.org>
> Commit-Queue: Maksim Sisov <msisov@igalia.com>
> Cr-Commit-Position: refs/heads/main@{#1448194}

Bug: 327532834
Change-Id: I0ababc1a60c4b2403e47dbf82c8416d65a046c53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6468397
Owners-Override: Maria Kazinova <kazinova@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Maria Kazinova <kazinova@google.com>
Auto-Submit: Maria Kazinova <kazinova@google.com>
Cr-Commit-Position: refs/heads/main@{#1448248}