Revert "Delete signin_metrics::AccessPoint::ACCESS_POINT_MEN, IDC_SHOW_SIGNIN and IDC_SHOW_SYNC_ERROR"

This reverts commit 9a61a9b029115f9e0d5909cb8b9652e42849ef78.

Reason for revert: build breakage (https://ci.chromium.org/ui/p/chrome/builders/ci/device-builder/164416/overview)

Original change's description:
> Delete signin_metrics::AccessPoint::ACCESS_POINT_MEN, IDC_SHOW_SIGNIN and IDC_SHOW_SYNC_ERROR
>
> These are no longer used.
>
> OBSOLETE_HISTOGRAM [WrenchMenu.TimeToAction.ShowSyncSetup]=No longer recorded
>
> Change-Id: I3920c795b72ccbff6ac6984918e4995629047d28
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4601458
> Commit-Queue: David Roger <droger@chromium.org>
> Reviewed-by: Alex Ilin <alexilin@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1155502}

Change-Id: I2edb3307867f0e46c595ffc2130a6c8fdff459b9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4604316
Owners-Override: Federica Germinario <fedegermi@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Federica Germinario <fedegermi@google.com>
Cr-Commit-Position: refs/heads/main@{#1155521}