Reland "Fix undo / redo filling with empty steps" (#1653)

* Revert "Revert "Fix undo / redo filling with empty steps (#1649)" (#1652)"

This reverts commit 7623810166.

* Update test expectations

* Add dirty flag if workflow is not persisted

* Add dirty flag to other UI areas for new workflows

* Remove redundant code

* Fix regression: undo / redo steps lost on refresh

The history is still be cleared, but any changes made by issuing undo / redo comands prior to refresh are not lost.

* Update test expectations

Partially reverts f8cc2c0d67 - adds dirty flags back to unsaved workflows.

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Co-authored-by: filtered <176114999+webfiltered@users.noreply.github.com>

src/components/sidebar/tabs/WorkflowsSidebarTab.vue

@@ -50,7 +50,9 @@
             <template #node="{ node }">
               <TreeExplorerTreeNode :node="node">
                 <template #before-label="{ node }">
-                  <span v-if="node.data.isModified">*</span>
+                  <span v-if="node.data.isModified || !node.data.isPersisted"
+                    >*</span
+                  >
                 </template>
                 <template #actions="{ node }">
                   <Button