refactor ♻️: Refactor ExecStart to use a list for commands and conditionally execute them.

This refactoring involves restructuring the `ExecStart` method to utilize a list of commands instead of a single string. This change allows for more flexible execution based on certain conditions, enhancing the modularity and maintainability of the code.

templates/90-wol.rules.j2

@@ -0,0 +1,3 @@
+{% for interface in wol_final_interfaces %}
+ACTION=="add", SUBSYSTEM=="net", KERNEL=="{{ interface }}", RUN+="/sbin/ethtool -s {{ interface }} wol {{ wol_mode }}"
+{% endfor %}