Deduplicate image fetch triggers on sync invalidations

When credit card data changes, the native side triggers image fetching
on Android clients. In addition, the Java PDM which is a PDM observer
also triggers image fetching.

Remove the duplicate image fetching call from the Java PDM.

This also decouples AutofillImageFetcher and PersonalDataManager on the
Java side.
go/detangle-java-afimagefetcher-from-pdm

Fixed: 394974717
Change-Id: I49f077717c65a8b6d172bfd8064a892692b5b8af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6242096
Commit-Queue: Vishwas Uppoor <vishwasuppoor@google.com>
Reviewed-by: Siddharth Shah <siashah@chromium.org>
Reviewed-by: Timofey Chudakov <tchudakov@google.com>
Cr-Commit-Position: refs/heads/main@{#1444789}