Fix bgw_db_scheduler_fixed flakyness

Depending on date boundaries the number of chunks produced for the
cagg hypertable was not constant resulting on flaky tests on certain
days.

tsl/test/expected/bgw_db_scheduler_fixed.out

@@ -1619,6 +1619,12 @@ SELECT time_bucket('1 month', time), avg(a)
 FROM test_table_scheduler
 GROUP BY time_bucket('1 month', time)
 WITH NO DATA;
+SELECT set_chunk_time_interval('_timescaledb_internal._materialized_hypertable_2', interval '36500 days');
+ set_chunk_time_interval 
+-------------------------
+
+(1 row)
+
 select show_chunks('test_table_scheduler');
               show_chunks               
 ----------------------------------------
@@ -1694,11 +1700,11 @@ select hypertable_schema, hypertable_name, chunk_schema, chunk_name, is_compress
  _timescaledb_internal | _materialized_hypertable_2 | _timescaledb_internal | _hyper_2_10_chunk | f
 (5 rows)
 
-select avg_a from cagg_scheduler;
+select avg_a from cagg_scheduler ORDER BY 1;
        avg_a        
 --------------------
- 4.0000000000000000
  3.0000000000000000
+ 4.0000000000000000
 (2 rows)
 
 -- test the API for add_job too

tsl/test/sql/bgw_db_scheduler_fixed.sql

@@ -703,6 +703,8 @@ FROM test_table_scheduler
 GROUP BY time_bucket('1 month', time)
 WITH NO DATA;
 
+SELECT set_chunk_time_interval('_timescaledb_internal._materialized_hypertable_2', interval '36500 days');
+
 select show_chunks('test_table_scheduler');
 
 alter table test_table_scheduler set (timescaledb.compress, timescaledb.compress_orderby = 'time DESC');
@@ -717,7 +719,7 @@ SELECT * from _timescaledb_internal.bgw_job_stat;
 
 SELECT show_chunks('test_table_scheduler');
 select hypertable_schema, hypertable_name, chunk_schema, chunk_name, is_compressed from timescaledb_information.chunks ;
-select avg_a from cagg_scheduler;
+select avg_a from cagg_scheduler ORDER BY 1;
 -- test the API for add_job too
 create or replace procedure job_test_fixed(jobid int, config jsonb) language plpgsql as $$
 begin