Goodbye, GraphQL (#24827)

```release-note
NONE
```

server/public/model/team.go

@@ -287,24 +287,3 @@ func (o *Team) ShallowCopy() *Team {
 	c := *o
 	return &c
 }
-
-// The following are some GraphQL methods necessary to return the
-// data in float64 type. The spec doesn't support 64 bit integers,
-// so we have to pass the data in float64. The _ at the end is
-// a hack to keep the attribute name same in GraphQL schema.
-
-func (o *Team) CreateAt_() float64 {
-	return float64(o.UpdateAt)
-}
-
-func (o *Team) UpdateAt_() float64 {
-	return float64(o.UpdateAt)
-}
-
-func (o *Team) DeleteAt_() float64 {
-	return float64(o.DeleteAt)
-}
-
-func (o *Team) LastTeamIconUpdate_() float64 {
-	return float64(o.LastTeamIconUpdate)
-}