fix: prevent scaling plan changes from blocking CI

[glasnt]

Observed in https://github.com/GoogleCloudPlatform/terraform-dynamic-python-webapp/runs/67362203830

There may be a change to the provider that is causing scaling arguments to change between creation and re-planning when left unchanged:

   ~ resource "google_cloud_run_v2_service" "server" {
         id                      = "projects/ci-dynamic-python-webapp-dc63/locations/us-central1/services/server"
         name                    = "server"
         # (33 unchanged attributes hidden)
 
       - scaling {
           - manual_instance_count = 0 -> null
           - min_instance_count    = 0 -> null
             # (1 unchanged attribute hidden)
         }
 
         # (2 unchanged blocks hidden)
     }
 
 Plan: 0 to add, 1 to change, 0 to destroy.

This change should allow for the template.scaling changes to be ignored, this letting PRs like #425 for unrelated changes pass.

[glasnt]

/gcbrun