Prevent writes to sync for Home and Work addresses

Writes to addresses come in two forms:
- User-triggered writes: Settings, updates, etc.
- Metadata-related writes: Whenever e.g. an address is used, its use
  count is incremented.

Since H/W is meant to be read-only on the client side, the first types
of writes will be prevented in the UI. This CL makes sure that the
second types of writes are not committed to CONTACT_INFO.

Committing them wouldn't make sense, as GAS doesn't store metadata about
H/W [1] and thus couldn't persist the committed data. Any metadata
updates are only stored locally, in the on-device database (and as a
result, are lost during the next sign-out + sign-in).

[1] http://shortn/_lnK9U8Gy6z

Bug: 354706653
Change-Id: I8a654818d6901eb94b55c8bc6c120a24a9b82f66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6519816
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Florian Leimgruber <fleimgruber@google.com>
Cr-Commit-Position: refs/heads/main@{#1457524}