Increase size limits

Incidents contain traces with average size of 8 MB. We hit the upload
size limit of 100 MB before the upload count limit of 50. Increase the
size limit to 400 MB to upload more traces.

Previous increase: http://ag/7695408

Bug: 214244170
Test: incidentd_test
Change-Id: Iae2f856d375f126f23191d152e4a46243fa3f38f