* [docstore] add useSecondary flag to projectHasRanges
The rev-check for unarchiving always consults with the primary.
Two extra changes:
- Add a projection argument to peekDoc in order to skip lines download
from projectHasRanges.
- Add one retry to peekDoc to reduce chances of surfacing a rev-check
violation.
* [web] resync_projects: use the secondaries for all reads
* [web] add default value for useSecondary
* [docstore] add default value for useSecondary
* [k8s] docstore: set MONGO_HAS_SECONDARIES=true
GitOrigin-RevId: f15ec4fdc1cabe74c1eab87bec85f28d6f7a587d
