Replace $emit call with single arg in EscalationPolicies

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/64514

ee/app/assets/javascripts/escalation_policies/components/add_edit_escalation_policy_form.vue

@@ -97,7 +97,7 @@ export default {
     addRule() {
       this.rules.push({ ...cloneDeep(DEFAULT_ESCALATION_RULE), key: uniqueId() });
     },
-    updateEscalationRules(index, rule) {
+    updateEscalationRules({ rule, index }) {
       this.rules[index] = { ...this.rules[index], ...rule };
       this.emitRulesUpdate();
     },

ee/app/assets/javascripts/escalation_policies/components/escalation_rule.vue

@@ -113,11 +113,14 @@ export default {
       this.emitUpdate();
     },
     emitUpdate() {
-      this.$emit('update-escalation-rule', this.index, {
+      this.$emit('update-escalation-rule', {
+        index: this.index,
+        rule: {
           oncallScheduleIid: parseInt(this.oncallScheduleIid, 10),
           action: this.action,
           status: this.status,
           elapsedTimeSeconds: parseInt(this.elapsedTimeSeconds, 10),
+        },
       });
     },
   },

ee/spec/frontend/escalation_policies/add_edit_escalation_policy_form_spec.js

@@ -85,7 +85,7 @@ describe('AddEscalationPolicyForm', () => {
         elapsedTimeSeconds: 30,
         oncallScheduleIid: 2,
       };
-      findRules().at(0).vm.$emit('update-escalation-rule', 0, updatedRule);
+      findRules().at(0).vm.$emit('update-escalation-rule', { index: 0, rule: updatedRule });
       expect(wrapper.emitted('update-escalation-policy-form')[0]).toEqual([
         { field: 'rules', value: [expect.objectContaining(updatedRule)] },
       ]);