feat: Allow move state on new Observability resources (#593)

* feat: Allow move state on new Observability resources

* Extend description to explain how to move a argus resource to observability

* Update argus docs with examples how to move a resource to observability

---------

Co-authored-by: Marcel Jacek <Marcel.Jacek@stackit.cloud>

stackit/internal/services/argus/scrapeconfig/const.go

@@ -0,0 +1,50 @@
+package argus
+
+const exampleMoveToObservability = "## Example move\n" +
+	"Example to move the deprecated `stackit_argus_scrapeconfig` resource to the new `stackit_observability_scrapeconfig` resource:" + "\n" +
+	"1. Add a new `stackit_observability_scrapeconfig` resource with the same values like your previous `stackit_argus_scrapeconfig` resource." + "\n" +
+	"1. Add a moved block which reference the `stackit_argus_scrapeconfig` and `stackit_observability_scrapeconfig` resource." + "\n" +
+	"1. Remove your old `stackit_argus_scrapeconfig` resource and run `$ terraform apply`." + "\n" +
+	"```terraform" +
+	`
+resource "stackit_argus_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"
+      }
+    }
+  ]
+}
+
+moved {
+	from = stackit_argus_scrapeconfig.example
+	to = stackit_observability_scrapeconfig.example
+}
+
+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"
+      }
+    }
+  ]
+}
+` + "```" + "\n"