Remove unneeded Auth Extension files (#842)

* Remove unneeded Auth Extension files

* feedback

extension/googleclientauthextension/README.md

@@ -41,13 +41,3 @@ Following are the configuration fields:
 - **project** - The Google Cloud Project telemetry is sent to if the gcp.project.id resource attribute is not set. If unspecified, this is determined using application default credentials.
 - [**scopes**](https://datatracker.ietf.org/doc/html/rfc6749#section-3.3) - The oauth 2.0 scopes requested by the extension.
 - [**quota_project**](https://cloud.google.com/apis/docs/system-parameters) - The project for quota and billing purposes. The caller must have serviceusage.services.use permission on the project.
-
-## Building into a Collector
-
-This extension is not included in any collector distributions today. To build a collector with this component, add the following to your collector builder configuration:
-
-```yaml
-extensions:
-  - import: github.com/GoogleCloudPlatform/opentelemetry-operations-go/extension/googleclientauthextension
-    gomod: github.com/GoogleCloudPlatform/opentelemetry-operations-go/extension/googleclientauthextension v0.43.0
-```

extension/googleclientauthextension/factory.go

@@ -23,20 +23,8 @@ import (
 	"go.opentelemetry.io/collector/extension"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/grpc/credentials/oauth"
-
-	"github.com/GoogleCloudPlatform/opentelemetry-operations-go/extension/googleclientauthextension/internal/metadata"
 )
 
-// NewFactory creates a factory for the GCP Auth extension.
-func NewFactory() extension.Factory {
-	return extension.NewFactory(
-		metadata.Type,
-		CreateDefaultConfig,
-		CreateExtension,
-		metadata.ExtensionStability,
-	)
-}
-
 func CreateExtension(ctx context.Context, set extension.CreateSettings, cfg component.Config) (extension.Extension, error) {
 	config := cfg.(*Config)
 	ca := &clientAuthenticator{

extension/googleclientauthextension/factory_test.go

@@ -24,27 +24,21 @@ import (
 )
 
 func TestCreateDefaultConfig(t *testing.T) {
-	factory := NewFactory()
-	cfg := factory.CreateDefaultConfig()
+	cfg := CreateDefaultConfig()
 	assert.NotNil(t, cfg, "failed to create default config")
 	assert.NoError(t, componenttest.CheckConfigStruct(cfg))
 }
 
-func TestNewFactory(t *testing.T) {
-	f := NewFactory()
-	assert.NotNil(t, f)
-}
-
 func TestCreateExtension(t *testing.T) {
 	t.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "testdata/fake_creds.json")
-	ext, err := NewFactory().CreateExtension(context.Background(), extension.CreateSettings{}, CreateDefaultConfig())
+	ext, err := CreateExtension(context.Background(), extension.CreateSettings{}, CreateDefaultConfig())
 	assert.NotNil(t, ext)
 	assert.NoError(t, err)
 }
 
 func TestStart(t *testing.T) {
 	t.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "testdata/fake_creds.json")
-	ext, err := NewFactory().CreateExtension(context.Background(), extension.CreateSettings{}, CreateDefaultConfig())
+	ext, err := CreateExtension(context.Background(), extension.CreateSettings{}, CreateDefaultConfig())
 	assert.NotNil(t, ext)
 	assert.NoError(t, err)
 	err = ext.Start(context.Background(), nil)
@@ -53,7 +47,7 @@ func TestStart(t *testing.T) {
 
 func TestStart_WithError(t *testing.T) {
 	t.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "testdata/foo.json")
-	ext, err := NewFactory().CreateExtension(context.Background(), extension.CreateSettings{}, CreateDefaultConfig())
+	ext, err := CreateExtension(context.Background(), extension.CreateSettings{}, CreateDefaultConfig())
 	assert.NotNil(t, ext)
 	assert.NoError(t, err)
 	err = ext.Start(context.Background(), nil)

extension/googleclientauthextension/go.mod

@@ -5,7 +5,6 @@ go 1.21
 require (
 	github.com/stretchr/testify v1.9.0
 	go.opentelemetry.io/collector/component v0.99.0
-	go.opentelemetry.io/collector/confmap v0.99.0
 	go.opentelemetry.io/collector/extension v0.94.0
 	golang.org/x/oauth2 v0.18.0
 	google.golang.org/grpc v1.63.2
@@ -33,6 +32,7 @@ require (
 	github.com/prometheus/common v0.52.3 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
 	go.opentelemetry.io/collector/config/configtelemetry v0.99.0 // indirect
+	go.opentelemetry.io/collector/confmap v0.99.0 // indirect
 	go.opentelemetry.io/collector/pdata v1.6.0 // indirect
 	go.opentelemetry.io/otel v1.25.0 // indirect
 	go.opentelemetry.io/otel/exporters/prometheus v0.47.0 // indirect