[MM-15797] Migrate Session.Remove to Sync by default (#11069)

* [MM-15797] Migrate Session.Remove to Sync by default

* Remove unnecessary channel logic and simplify

* Refactor code to be more consistent with code base

* Rename variable to avoid shadow declaration

* Add missing checks in tests

* Regenerate the mocks

* Run gofmt over code

store/storetest/mocks/SessionStore.go

@@ -6,7 +6,6 @@ package mocks
 
 import mock "github.com/stretchr/testify/mock"
 import model "github.com/mattermost/mattermost-server/model"
-import store "github.com/mattermost/mattermost-server/store"
 
 // SessionStore is an autogenerated mock type for the SessionStore type
 type SessionStore struct {
@@ -133,15 +132,15 @@ func (_m *SessionStore) PermanentDeleteSessionsByUser(teamId string) *model.AppE
 }
 
 // Remove provides a mock function with given fields: sessionIdOrToken
-func (_m *SessionStore) Remove(sessionIdOrToken string) store.StoreChannel {
+func (_m *SessionStore) Remove(sessionIdOrToken string) *model.AppError {
 	ret := _m.Called(sessionIdOrToken)
 
-	var r0 store.StoreChannel
-	if rf, ok := ret.Get(0).(func(string) store.StoreChannel); ok {
+	var r0 *model.AppError
+	if rf, ok := ret.Get(0).(func(string) *model.AppError); ok {
 		r0 = rf(sessionIdOrToken)
 	} else {
 		if ret.Get(0) != nil {
-			r0 = ret.Get(0).(store.StoreChannel)
+			r0 = ret.Get(0).(*model.AppError)
 		}
 	}