Externalise the high ISIS metric into oss-params

No need to change code when the high ISIS metric changes. It's part of the oss-params now.

As an added bonus, I've removed the example config in conftest.py as it now uses the example file instead. This also should help with keeping this example file up-to-date.

gso/utils/workflow_steps.py

@@ -9,6 +9,7 @@ from orchestrator.utils.json import json_dumps
 
 from gso.products.product_types.iptrunk import Iptrunk
 from gso.services.provisioning_proxy import execute_playbook
+from gso.settings import load_oss_params
 
 
 def _deploy_base_config(
@@ -62,11 +63,12 @@ def deploy_base_config_real(
     return {"subscription": subscription}
 
 
-@step("[COMMIT] Set ISIS metric to 90.000")
-def set_isis_to_90000(subscription: Iptrunk, process_id: UUIDstr, callback_route: str, tt_number: str) -> State:
-    """Workflow step for setting the :term:`ISIS` metric to 90k as an arbitrarily high value to drain a link."""
+@step("[COMMIT] Set ISIS metric to very high value")
+def set_isis_to_max(subscription: Iptrunk, process_id: UUIDstr, callback_route: str, tt_number: str) -> State:
+    """Workflow step for setting the :term:`ISIS` metric to an arbitrarily high value to drain a link."""
     old_isis_metric = subscription.iptrunk.iptrunk_isis_metric
-    subscription.iptrunk.iptrunk_isis_metric = 90000
+    params = load_oss_params()
+    subscription.iptrunk.iptrunk_isis_metric = params.GENERAL.isis_high_metric
     extra_vars = {
         "wfo_trunk_json": json.loads(json_dumps(subscription)),
         "dry_run": False,