Publish update info via SystemUpdateManager

When 16K OTA is applied, this info would need to be published
to a SystemUpdateManager so that we don't clobber the updates with
other pending updates. Similarly, Fetch the pending update info from
SystemUpdateManager before applying update.

Test: m Settings && adb install -r $ANDROID_PRODUCT_OUT/system_ext/priv-app/Settings/Settings.apk
Bug: 302391134
Bug: 295035851
Change-Id: I4998122942d7f2defd69bc34474230c8aea3c25a