[MM-15803] Migrate "Session.AnalyticsSessionCount" to Sync by default (#10948)

* [MM-15803] Migrate "Session.AnalyticsSessionCount" to Sync by default

* Use Explict Async for sessionChan in analytics.go

store/storetest/mocks/SessionStore.go

@@ -14,19 +14,26 @@ type SessionStore struct {
 }
 
 // AnalyticsSessionCount provides a mock function with given fields:
-func (_m *SessionStore) AnalyticsSessionCount() store.StoreChannel {
+func (_m *SessionStore) AnalyticsSessionCount() (int64, *model.AppError) {
 	ret := _m.Called()
 
-	var r0 store.StoreChannel
-	if rf, ok := ret.Get(0).(func() store.StoreChannel); ok {
+	var r0 int64
+	if rf, ok := ret.Get(0).(func() int64); ok {
 		r0 = rf()
 	} else {
-		if ret.Get(0) != nil {
-			r0 = ret.Get(0).(store.StoreChannel)
+		r0 = ret.Get(0).(int64)
+	}
+
+	var r1 *model.AppError
+	if rf, ok := ret.Get(1).(func() *model.AppError); ok {
+		r1 = rf()
+	} else {
+		if ret.Get(1) != nil {
+			r1 = ret.Get(1).(*model.AppError)
 		}
 	}
 
-	return r0
+	return r0, r1
 }
 
 // Cleanup provides a mock function with given fields: expiryTime, batchSize