[25Q3] Default vals on exception + strange histograms

This fixes the default values on exceptions bug, and also may contribute to a fix on the strange histograms in the candidate phase issue we've been seeing.

For the default values, we were missing a 'handover' method from candidate to final atom *when there were failures*. This means successful cases looked accurate, whereas failing cases had inaccuracies and default values.

This same reason was - only in failing cases - not fully transferring the provider data's 'responseCollective' (aka aggregate information). This, along with the recent Samsung bug finding on UIs, may be the root cause of our discrepent histogram issues.

Bug: 405199548
Bug: 402180648
Test: Build and StatsD
Flag: android.credentials.flags.metric_bugfixes_continued
Change-Id: I9cc798ae454630870160fc5bd2e5fdae87850288