feat(cluster_scripts): dynamic port allocation per pool count

Updated the port allocation logic to dynamically allocate 100 ports
for every 15 pools. This ensures better scalability and avoids port
conflicts when the number of pools increases.

- Modified `get_instance_ports` method in `cluster_scripts.py`

Author: mkoura

cardano_node_tests/utils/cluster_scripts.py

@@ -166,11 +166,12 @@ def _preselect_addr(self, instance_num: int) -> str:
 
     def get_instance_ports(self, instance_num: int) -> InstancePorts:
         """Return ports mapping for given cluster instance."""
-        ports_per_instance = 100
-        ports_per_node = 5
+        # Allocate 100 ports per each 15 pools
+        ports_per_instance = ((self.num_pools - 1) // 15 + 1) * 100
         offset = instance_num * ports_per_instance
         base = 32000 + offset
         last_port = base + ports_per_instance - 1
+        ports_per_node = 5
 
         def _get_node_ports(num: int) -> NodePorts:
             rec_base = base + (num * ports_per_node)