Disable autovacuum on TSL regression tests

We disable autovacuum on Apache regression tests to avoid flaky results
and time to time we face some issues on TSL regression tests as well.

https://github.com/timescale/timescaledb/actions/runs/11470614522/job/31920227424#step:12:43

tsl/test/postgresql.conf.in

@@ -1,6 +1,6 @@
 # This section has to be equivalent to test/postgresql.conf
 
-autovacuum=true
+autovacuum=false
 datestyle='Postgres, MDY'
 hba_file='@TEST_PG_HBA_FILE@'
 log_destination='@TEST_PG_LOG_DESTINATION@'