[DEVEX-134] Fixed scale_metrics variable and added others for cooldown, statistic, time_window and time_aggregation configuration

[mamu0]

List of changes

Edit file variables.tf and locals.tf of azure_app_service_plan_autoscaler.

Motivation and context

In this PR, the scale_metrics variable for the autoscaler has been fixed, and variables for cooldown, statistics, time_window and time aggregation have been added.

Type of changes

• [ ] Add new resources
• [x] Update configuration to existing resources
• [ ] Remove existing resources

Does this introduce a change to production resources with possible user impact?

• [ ] Yes, users may be impacted applying this change
• [x] No

Other information