fix(workflow): enable workflow per method (#1569)

Workflow needs to be enabled per method. `persistEntry` should only use it when persisting an unpublished entry, but must behave as if workflow were not enabled for publishing. This fixes a 2.0 regression.

packages/netlify-cms-backend-test/src/implementation.js

@@ -134,7 +134,7 @@ export default class TestRepo {
   }
 
   persistEntry({ path, raw, slug }, mediaFiles = [], options = {}) {
-    if (this.options.useWorkflow) {
+    if (options.useWorkflow) {
       const unpubStore = window.repoFilesUnpublished;
       const existingEntryIndex = unpubStore.findIndex(e => e.file.path === path);
       if (existingEntryIndex >= 0) {