[O11y][AWS] Migrate AWS Billing dashboard visualizations to lens (#6644)

* Migrate AWS Billing dashboard visualizations to lens

* Update changelog

* Export dashboards from 8.8.1

* Export dashboards from 8.7.0

Author: rajvi-patel-22

packages/aws/changelog.yml

@@ -1,4 +1,9 @@
 # newer versions go on top
+- version: "1.50.2"
+  changes:
+    - description: Migrate AWS Billing dashboard visualizations to lens.
+      type: enhancement
+      link: https://github.com/elastic/integrations/pull/6644
 - version: "1.50.1"
   changes:
     - description: Add AWS API Gateway logs dashboard.