Revert "Rename argus to observability (#510)" (#515)

This reverts commit cc3cf05307.

examples/resources/stackit_observability_scrapeconfig/resource.tf

@@ -1,17 +0,0 @@
-resource "stackit_observability_scrapeconfig" "example" {
-  project_id   = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
-  instance_id  = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
-  name         = "example-job"
-  metrics_path = "/my-metrics"
-  saml2 = {
-    enable_url_parameters = true
-  }
-  targets = [
-    {
-      urls = ["url1", "urls2"]
-      labels = {
-        "url1" = "dev"
-      }
-    }
-  ]
-}