Change factories_config type in FAST and project/vpc factory modules, add YAML schema validation (#3728)

* stage 0

* stage 1

* networking

* security

* pf stage

* tfdoc

* align schemas

* inventory

* fix observability

* pf module

* pf module budgets

* align fast stages

* align project subfactories

* tfdoc

* schema validation

* add missing schemas

* Fix observability types

---------

Co-authored-by: Julio Castillo <jccb@google.com>

.github/workflows/linting.yml

@@ -90,6 +90,11 @@ jobs:
         run: |
           python3 tools/check_names.py --prefix-length=10 --failed-only fast/stages
 
+      - name: Check YAML schemas
+        id: yaml-schema
+        run: |
+          python3 tools/check_yaml_schema.py modules fast
+
       - name: Check python formatting
         id: yapf
         uses: pre-commit/action@1b06ec171f2f6faa71ed760c4042bd969e4f8b43