synchronize_log_template: limit query result on DB rather than client

[Taragolis]

In two queries in this function we take only need the first record, however database might return more than one record.

2023-11-02 13:30:24,586 INFO sqlalchemy.engine.Engine SELECT log_template.filename, log_template.elasticsearch_id 
FROM log_template ORDER BY log_template.id DESC

So for prevent unwanted traffic between DB Backend and Airflow better to limit it on DB side

[2023-11-02T13:30:48.927+0400] {base.py:1863} INFO - SELECT log_template.filename, log_template.elasticsearch_id 
FROM log_template ORDER BY log_template.id DESC 
 LIMIT %(param_1)s
2023-11-02 13:30:48,927 INFO sqlalchemy.engine.Engine [generated in 0.00012s] {'param_1': 1}

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