MM-35030: Hoist GetDBVersion before creating store (#17764)

* MM-35030: Hoist GetDBVersion before creating store

The creation of the store included running the migrations
which means that SQL statements would be executed before
we could make the check for DB version.

We perform the DB check before running the migrations.

https://mattermost.atlassian.net/browse/MM-35030

```release-note
NONE
```

* fix lint error

app/server.go

@@ -20,7 +20,6 @@ import (
 	"os/exec"
 	"path"
 	"runtime"
-	"strconv"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -360,19 +359,6 @@ func NewServer(options ...Option) (*Server, error) {
 	if s.newStore == nil {
 		s.newStore = func() (store.Store, error) {
 			s.sqlStore = sqlstore.New(s.Config().SqlSettings, s.Metrics)
-			if s.sqlStore.DriverName() == model.DATABASE_DRIVER_POSTGRES {
-				ver, err2 := s.sqlStore.GetDbVersion(true)
-				if err2 != nil {
-					return nil, errors.Wrap(err2, "cannot get DB version")
-				}
-				intVer, err2 := strconv.Atoi(ver)
-				if err2 != nil {
-					return nil, errors.Wrap(err2, "cannot parse DB version")
-				}
-				if intVer < sqlstore.MinimumRequiredPostgresVersion {
-					return nil, fmt.Errorf("minimum required postgres version is %s; found %s", sqlstore.VersionString(sqlstore.MinimumRequiredPostgresVersion), sqlstore.VersionString(intVer))
-				}
-			}
 
 			lcl, err2 := localcachelayer.NewLocalCacheLayer(
 				retrylayer.New(s.sqlStore),