feat: Implement get previous steps rest API endpoint

packages/backend/src/controllers/api/v1/steps/get-previous-steps.js

@@ -0,0 +1,27 @@
+import { ref } from 'objection';
+import ExecutionStep from '../../../../models/execution-step.js';
+import { renderObject } from '../../../../helpers/renderer.js';
+
+export default async (request, response) => {
+  const step = await request.currentUser.authorizedSteps
+    .clone()
+    .findOne({ 'steps.id': request.params.stepId })
+    .throwIfNotFound();
+
+  const previousSteps = await request.currentUser.authorizedSteps
+    .clone()
+    .withGraphJoined('executionSteps')
+    .where('flow_id', '=', step.flowId)
+    .andWhere('position', '<', step.position)
+    .andWhere(
+      'executionSteps.created_at',
+      '=',
+      ExecutionStep.query()
+        .max('created_at')
+        .where('step_id', '=', ref('steps.id'))
+        .andWhere('status', 'success')
+    )
+    .orderBy('steps.position', 'asc');
+
+  renderObject(response, previousSteps);
+};