[Histograms] Extend Signin.Intercept.ChromeSignin.* expiry date

Histogram just expired few days ago, the change will be merged back in
M139, to make sure the collection of data is discontinued.

Fixed: 417217495
Change-Id: I6cc567224fb1f39c57637d4e3a5638a7da962243
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6668418
Auto-Submit: Ryan Sultanem <rsult@google.com>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Commit-Queue: Ryan Sultanem <rsult@google.com>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1478433}