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

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

server/channels/app/platform/service.go

@@ -303,7 +303,7 @@ func New(sc ServiceConfig, options ...Option) (*PlatformService, error) {
 		Name:           "Status",
 		Size:           model.StatusCacheSize,
 		Striped:        true,
-		StripedBuckets: maxInt(runtime.NumCPU()-1, 1),
+		StripedBuckets: max(runtime.NumCPU()-1, 1),
 		DefaultExpiry:  30 * time.Minute,
 	})
 	if err != nil {
@@ -314,7 +314,7 @@ func New(sc ServiceConfig, options ...Option) (*PlatformService, error) {
 		Name:           "Session",
 		Size:           model.SessionCacheSize,
 		Striped:        true,
-		StripedBuckets: maxInt(runtime.NumCPU()-1, 1),
+		StripedBuckets: max(runtime.NumCPU()-1, 1),
 	})
 	if err != nil {
 		return nil, fmt.Errorf("could not create session cache: %w", err)

server/channels/app/platform/utils.go

@@ -14,13 +14,6 @@ func getKeyHash(key string) string {
 	return base64.StdEncoding.EncodeToString(hash.Sum(nil))
 }
 
-func maxInt(a, b int) int {
-	if a > b {
-		return a
-	}
-	return b
-}
-
 // allocateCacheTargets is used to fill target value types
 // for getting items from cache.
 func allocateCacheTargets[T any](l int) []any {