chore: CHK-3662 [Checkout-function] dismissione function checkout

[ciuffagianluca]

Remove checkout functions following this order

1. remove module module.apim_checkout_transactions_api_v1
2. remove resource azurerm_api_management_api_version_set.checkout_transactions_api
3. remove resource azurerm_monitor_metric_alert.checkout_fn_5xx
4. remove resource azurerm_monitor_autoscale_setting.checkout_function
5. remove module.checkout_function
6. remove module.checkout_function_snet

After all this removal operations try to apply for resource azurerm_monitor_scheduled_query_rules_alert.checkout_availability it should not show changes for this alert.

List of changes

Remove checkout functions api and function app

Motivation and context

Reduce costs and removed obsolete functions

Type of changes

• Add new resources
• 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
• No

Does this introduce an unwanted change on infrastructure? Check terraform plan execution result

• Yes
• No

Other information

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If PR is partially applied, why? (reserved to mantainers)