Revert "Save page received from page server in local file cache"

This reverts commit 137472db91.

control_plane/src/compute.rs

@@ -324,7 +324,6 @@ impl PostgresNode {
                  max_connections = 100\n\
                  wal_sender_timeout = 0\n\
                  wal_level = replica\n\
-				 zenith.file_cache_size = 4096\n\
                  listen_addresses = '{address}'\n\
                  port = {port}\n",
                 address = self.address.ip(),

test_runner/batch_others/test_pgbench.py

@@ -12,5 +12,5 @@ def test_pgbench(postgres: PostgresFactory, pg_bin, zenith_cli):
 
     connstr = pg.connstr()
 
-    pg_bin.run_capture(['pgbench', '-i', '-s', '100', connstr])
-    pg_bin.run_capture(['pgbench'] + '-c 10 -T 100 -N -P 1 -M prepared'.split() + [connstr])
+    pg_bin.run_capture(['pgbench', '-i', connstr])
+    pg_bin.run_capture(['pgbench'] + '-c 10 -T 5 -P 1 -M prepared'.split() + [connstr])