fix(cluster): add 1-hour timeout for cluster acquisition

Previously, the cluster acquisition loop could run indefinitely if a
cluster instance was not available. This change introduces a one-hour
timeout to prevent hanging tests. If the deadline is reached, a
TimeoutError is raised with a descriptive message.

Author: mkoura

cardano_node_tests/cluster_management/cluster_getter.py

@@ -805,8 +805,13 @@ def get_cluster_instance(  # noqa: C901
 
         self.log(f"want to run test '{cget_status.current_test}'")
 
-        # Iterate until it is possible to start the test
+        # Iterate until it is possible to start the test. Timeout after one hour.
+        deadline = time.monotonic() + 3600
         while True:
+            if time.monotonic() >= deadline:
+                msg = "Timeout while waiting to obtain cluster instance."
+                raise TimeoutError(msg)
+
             if cget_status.respin_ready:
                 self._respin(scriptsdir=scriptsdir)