use custom args instead of local.file args for import.file

import.file should not have "isSecret" arg because the imported module is not exported.
It should then not use the same args as local.file

pkg/flow/internal/importsource/import_file.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"reflect"
+	"time"
 
 	"github.com/grafana/agent/component"
 	"github.com/grafana/agent/component/local/file"
@@ -31,13 +32,28 @@ func NewImportFile(managedOpts component.Options, eval *vm.Evaluator, onContentC
 	}
 }
 
+// Arguments holds values which are used to configure the local.file component.
+type Arguments struct {
+	// Filename indicates the file to watch.
+	Filename string `river:"filename,attr"`
+	// Type indicates how to detect changes to the file.
+	Type file.Detector `river:"detector,attr,optional"`
+	// PollFrequency determines the frequency to check for changes when Type is Poll.
+	PollFrequency time.Duration `river:"poll_frequency,attr,optional"`
+}
+
+var DefaultArguments = Arguments{
+	Type:          file.DetectorFSNotify,
+	PollFrequency: time.Minute,
+}
+
 type importFileConfigBlock struct {
-	LocalFileArguments file.Arguments `river:",squash"`
+	LocalFileArguments Arguments `river:",squash"`
 }
 
 // SetToDefault implements river.Defaulter.
 func (a *importFileConfigBlock) SetToDefault() {
-	a.LocalFileArguments = file.DefaultArguments
+	a.LocalFileArguments = DefaultArguments
 }
 
 func (im *ImportFile) Evaluate(scope *vm.Scope) error {
@@ -47,7 +63,13 @@ func (im *ImportFile) Evaluate(scope *vm.Scope) error {
 	}
 	if im.fileComponent == nil {
 		var err error
-		im.fileComponent, err = file.New(im.managedOpts, arguments.LocalFileArguments)
+		im.fileComponent, err = file.New(im.managedOpts, file.Arguments{
+			Filename:      arguments.LocalFileArguments.Filename,
+			Type:          arguments.LocalFileArguments.Type,
+			PollFrequency: arguments.LocalFileArguments.PollFrequency,
+			// isSecret is only used for exported values; modules are not exported
+			IsSecret: false,
+		})
 		if err != nil {
 			return fmt.Errorf("creating file component: %w", err)
 		}