feat: Implement get step connection API endpoint

packages/backend/test/mocks/rest/api/v1/steps/get-connection.js

@@ -0,0 +1,27 @@
+const getConnectionMock = async (connection) => {
+  const data = {
+    id: connection.id,
+    key: connection.key,
+    verified: connection.verified,
+    reconnectable: connection.reconnectable,
+    appAuthClientId: connection.appAuthClientId,
+    formattedData: {
+      screenName: connection.formattedData.screenName,
+    },
+    createdAt: connection.createdAt.getTime(),
+    updatedAt: connection.updatedAt.getTime(),
+  };
+
+  return {
+    data: data,
+    meta: {
+      count: 1,
+      currentPage: null,
+      isArray: false,
+      totalPages: null,
+      type: 'Connection',
+    },
+  };
+};
+
+export default getConnectionMock;