feat(editor): Add template Id to workflow metadata (#8088)

## Summary
Adding a link between the workflow and the template it originated from
by saving `templateId` in the workflow metadata

## Related tickets and issues
ADO-1537

## Review / Merge checklist
- [x] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))
- [ ] [Docs updated](https://github.com/n8n-io/n8n-docs) or follow-up
ticket created.
- [x] Tests included.
> A bug is not considered fixed, unless a test is added to prevent it
from happening again.
   > A feature is not complete without tests.

packages/editor-ui/src/components/MainHeader/WorkflowDetails.vue

@@ -537,6 +537,7 @@ export default defineComponent({
 					const exportData: IWorkflowToShare = {
 						...data,
 						meta: {
+							...(this.workflowsStore.workflow.meta || {}),
 							instanceId: this.rootStore.instanceId,
 						},
 						tags: (tags || []).map((tagId) => {