fix(sys-ctl-hlth-csp): ensure '--' separator is added when passing ignore list to checkcsp

Updated README to reflect correct usage with '--', adjusted script.py to always append separator, and simplified task template handling for consistency.

Ref: https://chatgpt.com/share/68dfc69b-7c94-800f-871b-3525deb8e374

roles/sys-ctl-hlth-csp/files/script.py

@@ -31,6 +31,7 @@ def run_checkcsp(domains, ignore_network_blocks_from):
     if ignore_network_blocks_from:
         cmd.append("--ignore-network-blocks-from")
         cmd.extend(ignore_network_blocks_from)
+        cmd.append("--")
 
     cmd += domains