[DoH] Update expiration of various DoH-related metrics

This unexpires the following metrics:
 - Net.DNS.DnsTask.AdditionalHttps.Unsolicited.*
 - Net.DNS.SecureDnsTask.DnsModeAutomatic.FailureTime
 - Net.DNS.UpgradeConfig.Ineligible.UnhandledOptions

Also, renews this metric that is expiring next month:
 - Net.DNS.UI.ProbeAttemptSuccess

Also, changing the owner to me since I'm taking on this DoH work

Fixed: 1341724, 1341725, 1341726, 1360121
Change-Id: I10fcb817675b7c52bec5e90e67e6545e9b8ce087
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3891697


Commit-Queue: Andrew Williams <awillia@google.com>
Reviewed-by: David Schinazi <dschinazi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1046027}