[FR] 8.7 Release Preparation and Update Main Branch to 8.8 (#2533)

* adding preparations for 8.8 release

* addressed flake single new line error

* froze and updated API schemas

* updated get_intregration_manifests

* adjusted boolean in find_latest_integration_version

.github/workflows/lock-versions.yml

@@ -6,7 +6,7 @@ on:
           description: 'List of branches to lock versions (ordered, comma separated)'
           required: true
           # 7.17 was intentionally skipped because it was added late and was bug fix only
-          default: '7.16,8.0,8.1,8.2,8.3,8.4,8.5,8.6'
+          default: '7.16,8.0,8.1,8.2,8.3,8.4,8.5,8.6,8.7'
 
 jobs:
   pr: