Removed the max/min family of functions (#28679)

They are in-built in Go now
```release-note
NONE
```

server/channels/store/localcachelayer/layer.go

@@ -152,7 +152,7 @@ func NewLocalCacheLayer(baseStore store.Store, metrics einterfaces.MetricsInterf
 		DefaultExpiry:          RoleCacheSec * time.Second,
 		InvalidateClusterEvent: model.ClusterEventInvalidateCacheForRoles,
 		Striped:                true,
-		StripedBuckets:         maxInt(runtime.NumCPU()-1, 1),
+		StripedBuckets:         max(runtime.NumCPU()-1, 1),
 	}); err != nil {
 		return
 	}
@@ -336,7 +336,7 @@ func NewLocalCacheLayer(baseStore store.Store, metrics einterfaces.MetricsInterf
 		DefaultExpiry:          UserProfileByIDSec * time.Second,
 		InvalidateClusterEvent: model.ClusterEventInvalidateCacheForProfileByIds,
 		Striped:                true,
-		StripedBuckets:         maxInt(runtime.NumCPU()-1, 1),
+		StripedBuckets:         max(runtime.NumCPU()-1, 1),
 	}); err != nil {
 		return
 	}
@@ -394,13 +394,6 @@ func NewLocalCacheLayer(baseStore store.Store, metrics einterfaces.MetricsInterf
 	return
 }
 
-func maxInt(a, b int) int {
-	if a > b {
-		return a
-	}
-	return b
-}
-
 func (s LocalCacheStore) Reaction() store.ReactionStore {
 	return s.reaction
 }