let mobile app use escalation options endpoints (#3847)

# What this PR does

## Which issue(s) this PR fixes

## Checklist

- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Changed
+
+- Allow mobile app to access escalation options endpoints @imtoori ([#3847](https://github.com/grafana/oncall/pull/3847))
+
 ## v1.3.102 (2024-02-06)
 
 ### Fixed

engine/apps/api/views/escalation_policy.py

@@ -12,6 +12,7 @@ from apps.api.serializers.escalation_policy import (
     EscalationPolicyUpdateSerializer,
 )
 from apps.auth_token.auth import PluginAuthentication
+from apps.mobile_app.auth import MobileAppAuthTokenAuthentication
 from common.api_helpers.mixins import (
     CreateSerializerMixin,
     PublicPrimaryKeyMixin,
@@ -29,7 +30,10 @@ class EscalationPolicyView(
     UpdateSerializerMixin,
     OrderedModelViewSet,
 ):
-    authentication_classes = (PluginAuthentication,)
+    authentication_classes = (
+        MobileAppAuthTokenAuthentication,
+        PluginAuthentication,
+    )
     permission_classes = (IsAuthenticated, RBACPermission)
     rbac_permissions = {
         "metadata": [RBACPermission.Permissions.ESCALATION_CHAINS_READ],