fix(lint): fix lll violations and additional gosec/prealloc findings

Co-authored-by: ivuorinen <11024+ivuorinen@users.noreply.github.com>

fail2ban/fail2ban_logs_integration_test.go

@@ -418,6 +418,7 @@ func BenchmarkLogParsing(b *testing.B) {
 	if err != nil {
 		b.Fatalf("Failed to read test file: %v", err)
 	}
+	// #nosec G703 -- mainLog is constructed from b.TempDir() and a literal string, not user input
 	if err := os.WriteFile(mainLog, data, 0600); err != nil {
 		b.Fatalf("Failed to create test log: %v", err)
 	}