Prep for 8.5 branch (#2220)

* adding first commit

* renamed branch

* adjusted packages, stack schema and updated schemas

* updated integrations manifest

* adjusted comments to be a little more organized

* adjusted stack-schema-map

* refreshed ecs and beats schema, adjusted stack schema map accordingly

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

(selectively cherry picked from commit 2a3b584433)

.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'
+          default: '7.16,8.0,8.1,8.2,8.3,8.4'
 
 jobs:
   pr: