Support Private Aggregation error reporting in Protected Audience (1/4)

Extends support for the new aggregate error reporting feature to
Protected Audience. This cl detects when an uncaught exception or other
error occurs and plumbs that to the PrivateAggregationBindings. A follow
up cl will use this boolean to trigger contributions conditional on the
event.

This cl is a no-op, but is split out for ease of reviewing.

Spec PR: https://github.com/WICG/turtledove/pull/1427

Bug: 381788013
Change-Id: I0da8daf58a5893ed50d90cfbe960d82ae490126f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6426087
Commit-Queue: Alex Turner <alexmt@chromium.org>
Reviewed-by: Qingxin Wu <qingxinwu@google.com>
Cr-Commit-Position: refs/heads/main@{#1449926}