refactor: move logs rotation to separated trigger which is enabled by default

Previous solution, well, worked kinda fine-ish, though we have much
better mechanisms to do so

tests/testresources/core/ahriman.ini

@@ -37,6 +37,9 @@ target =
 [keyring]
 target = keyring
 
+[logs-rotation]
+keep_last_logs = 5
+
 [mirrorlist]
 target = mirrorlist
 servers = http://localhost