Prep 8.19/9.1 (#4869)

* Prep 8.19/9.1 Release

* Download Beats Schema

* Download API Schema

* Download 8.18.3 Beats Schema

* Download Latest Integrations manifest and schema

* Comment old schemas

* Update Patch version

Removed changes from:
- detection_rules/etc/packages.yaml

(selectively cherry picked from commit 9b292b97ea)

.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: '8.14,8.15,8.16,8.17,8.18,9.0'
+          default: '8.18,8.19,9.0,9.1'
 
 jobs:
   pr: