Fix crash with disabled object storage (#3078)

### Description of change

Fixes: #3077 

## Summary by CodeRabbit

- **Refactor**
- Updated the dependency injection setup for the `objectstorage` module
to streamline service provisioning.

- **Documentation**
- Adjusted documentation to reflect changes in the `objectstorage`
service interface.

cmd/aperture-agent/agent.go

@@ -44,7 +44,7 @@ func main() {
 			agentinfo.ProvideAgentInfo,
 			clockwork.NewRealClock,
 			agent.ProvidePeersPrefix,
-			fx.Annotate(objectstorage.Provide, fx.As(new(objectstorage.ObjectStorageIface))),
+			objectstorage.Provide,
 			fx.Annotate(AgentElectionPath, fx.ResultTags(config.NameTag(etcdclient.ElectionPathFxTag))),
 		),
 		fx.Supply(fx.Annotate(false, fx.ResultTags(config.NameTag(etcdclient.EnforceLeaderOnlyFxTag)))),

pkg/objectstorage/provide.go

@@ -22,7 +22,7 @@ type ProvideParams struct {
 }
 
 // Provide ObjectStorage.
-func Provide(in ProvideParams) (*ObjectStorage, error) {
+func Provide(in ProvideParams) (ObjectStorageIface, error) {
 	var cfg storageconfig.ObjectStorageConfig
 	err := in.Unmarshaller.UnmarshalKey("object_storage", &cfg)
 	if err != nil {