Change snippet visibility to Private

So that the test can run on Production where Internal is disabled
See https://gitlab.com/gitlab-org/gitlab/-/issues/221016

qa/qa/specs/features/browser_ui/3_create/snippet/create_project_snippet_spec.rb

@@ -9,7 +9,7 @@ module QA
         Resource::ProjectSnippet.fabricate_via_browser_ui! do |snippet|
           snippet.title = 'Project snippet'
           snippet.description = ' '
-          snippet.visibility = 'Internal'
+          snippet.visibility = 'Private'
           snippet.file_name = 'markdown_file.md'
           snippet.file_content = "### Snippet heading\n\n[Gitlab link](https://gitlab.com/)"
         end
@@ -17,7 +17,7 @@ module QA
         Page::Dashboard::Snippet::Show.perform do |snippet|
           expect(snippet).to have_snippet_title('Project snippet')
           expect(snippet).to have_no_snippet_description
-          expect(snippet).to have_visibility_type(/internal/i)
+          expect(snippet).to have_visibility_type(/private/i)
           expect(snippet).to have_file_name('markdown_file.md')
           expect(snippet).to have_file_content('Snippet heading')
           expect(snippet).to have_file_content('Gitlab link')