[web] resync_projects: use the secondaries for all reads (#33684)

* [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

services/web/app/src/Features/Docstore/DocstoreManager.mjs

@@ -323,10 +323,12 @@ async function updateDoc(
  * Asks docstore whether any doc in the project has ranges
  *
  * @param {string} projectId
+ * @param {boolean} useSecondary
  */
-async function projectHasRanges(projectId) {
+async function projectHasRanges(projectId, useSecondary = false) {
   const url = new URL(settings.apis.docstore.url)
   url.pathname = path.posix.join('project', projectId, 'has-ranges')
+  if (useSecondary) url.searchParams.set('useSecondary', 'true')
   try {
     const body = await fetchJson(url, { signal: AbortSignal.timeout(TIMEOUT) })
     return body.projectHasRanges