fix(memory): enable jemalloc background_thread by default (#1260) #159

Job	Run time
build	2m 38s
ci (schema-sync, integration/schema_sync/run.sh)	50s
ci (ruby, integration/ruby/run.sh)	1m 49s
ci (mirror, integration/mirror/run.sh)	1m 11s
ci (copy-data, integration/copy_data/run.sh)	1m 25s
ci (rust, integration/rust/run.sh)	4m 48s
ci (sql, integration/sql/run.sh)	1m 0s
ci (js, integration/js/pg_tests/run.sh)	1m 27s
ci (pgbench, integration/pgbench/run.sh)	5m 49s
ci (toxi, integration/toxi/run.sh)	3m 38s
ci (go, integration/go/run.sh)	2m 1s
ci (resharding, integration/resharding/run.sh)	1m 39s
ci (complex, integration/complex/run.sh)	1m 44s
ci (java, integration/java/run.sh)	1m 15s
ci (python, integration/python/run.sh)	2m 28s
ci (plugins, integration/plugins/run.sh, true, true)	5m 14s
ci (tls, integration/tls/run.sh)	3m 32s
ci (dry-run, integration/dry_run/run.sh)	1m 17s
ci (load-balancer, integration/load_balancer/run.sh)	6m 50s
	50m 35s

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