Remove old LGTM configuration file #4260

Job	Run time
Run examples in 'session-example' on MySQL	1m 50s
Test with Java 17	4m 27s
Run examples in 'session-example' on PostgreSQL	2m 14s
Test with MariaDB	4m 18s
Test with Java 20	4m 18s
Test with MySQL	4m 57s
Run examples in 'native-sql-example' on PostgreSQL	2m 3s
Test with Java 21	4m 6s
Test with PostgreSQL	3m 57s
Test with Java 23	3m 41s
Test with MSSQLServer	5m 1s
Test with Java 24-ea	4m 21s
Test with CockroachDB	7m 9s
Test with Java 25-ea	3m 55s
Test with Db2	1h 17m 58s
Test with Oracle	5m 51s
	2h 20m 6s

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