js/modules: Drop HasModuleInstancePerVU interface

The new modules API made this API not required anymore. Both internal
and external modules can now use the same unique way for accessing the VU State.

js/initcontext.go

@@ -214,9 +214,6 @@ func (i *InitContext) requireModule(name string) (goja.Value, error) {
 		instance := m.NewModuleInstance(i.moduleVUImpl)
 		return i.moduleVUImpl.runtime.ToValue(toESModuleExports(instance.Exports())), nil
 	}
-	if perInstance, ok := mod.(modules.HasModuleInstancePerVU); ok {
-		mod = perInstance.NewModuleInstancePerVU()
-	}
 
 	onceBindWarning.Do(func() {
 		i.logger.Warnf(`Module '%s' is using deprecated APIs that will be removed in k6 v0.38.0,`+

js/modules/modules.go

@@ -57,13 +57,6 @@ func Register(name string, mod interface{}) {
 	modules[name] = mod
 }
 
-// HasModuleInstancePerVU should be implemented by all native Golang modules that
-// would require per-VU state. k6 will call their NewModuleInstancePerVU() methods
-// every time a VU imports the module and use its result as the returned object.
-type HasModuleInstancePerVU interface {
-	NewModuleInstancePerVU() interface{}
-}
-
 // Module is the interface js modules should implement in order to get access to the VU
 type Module interface {
 	// NewModuleInstance will get modules.VU that should provide the module with a way to interact with the VU