Revert "add feature flag pkg"

This reverts commit 81966b0ec6.

pkg/feature/feature.go

@@ -1,17 +0,0 @@
-package feature
-
-import (
-	"os"
-
-	"github.com/SAP/jenkins-library/pkg/log"
-)
-
-const prefix = "com_sap_piper_featureFlag_"
-
-func IsFeatureEnabled(flag string) bool {
-	if os.Getenv(prefix+flag) == "true" {
-		log.Entry().Infof("Feature '%s%s' is enabled", prefix, flag)
-		return true
-	}
-	return false
-}

pkg/feature/feature_test.go

@@ -1,20 +0,0 @@
-package feature
-
-import (
-	"os"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestIsFeatureEnabled(t *testing.T) {
-	t.Run("", func(t *testing.T) {
-		assert.False(t, IsFeatureEnabled("newFeature"))
-
-		// defer resetEnv(os.Environ())
-		os.Setenv(prefix+"newFeature", "true")
-		defer os.Setenv(prefix+"newFeature", "")
-
-		assert.True(t, IsFeatureEnabled("newFeature"))
-	})
-}