DodoApp: Implement branch and app delete functionalities.

Change-Id: I8bf6ed30a6274203e73e80f05a4b82896509ecb0
diff --git a/core/installer/welcome/env_test.go b/core/installer/welcome/env_test.go
index 439fdf2..448f221 100644
--- a/core/installer/welcome/env_test.go
+++ b/core/installer/welcome/env_test.go
@@ -190,6 +190,14 @@
 	return nil
 }
 
+func (f fakeSoftServeClient) DeleteRepoBranch(_, _ string) error {
+	return nil
+}
+
+func (f fakeSoftServeClient) DeleteRepo(_ string) error {
+	return nil
+}
+
 type fakeClientGetter struct {
 	t     *testing.T
 	envFS billy.Filesystem