Revert fix in db_migration.py

pytest/tests/sanity/db_migration.py

@@ -20,22 +20,10 @@
 
 NUM_SHARDS = 4
 EPOCH_LENGTH = 5
-# Used while the node is running with the old binary.
-LARGE_GC_NUM_EPOCHS_TO_KEEP = 15
-# Used while the node is running with the new binary.
-DEFAULT_GC_NUM_EPOCHS_TO_KEEP = 5
 
 # Config to track all shards.
 node_config = {
     "tracked_shards": list(range(NUM_SHARDS)),
-    # We should have large enough GC window while the node running with the old binary (2.0), because we need to
-    # bootstrap the congestion info from the genesis block and the genesis block should not be garbage collected.
-    # The new binary (2.1) has a mechanism to save the congestion info on disk to be resilient against GC of
-    # genesis block, however the old binary does not have this mechanism, thus we need to prevent GC to kick in
-    # before the node transitions to the new binary. Note that, after restarting the node with the new binary
-    # we can switch back to the usual GC window (see below).
-    # TODO(#11902): This change for GC can be removed when the old binary version becomes 2.1 in this test.
-    "gc_num_epochs_to_keep": LARGE_GC_NUM_EPOCHS_TO_KEEP,
 }
 
 
@@ -129,9 +117,6 @@ def main():
     send_some_tx(node)
     unstake_and_stake(nodes[1], node)
 
-    height, _ = utils.wait_for_blocks(node, count=1)
-    assert height < EPOCH_LENGTH * LARGE_GC_NUM_EPOCHS_TO_KEEP, "Node should run without GC"
-
     node.kill()
 
     logging.info(
@@ -141,7 +126,6 @@ def main():
     logging.info("Starting the current node...")
     node.near_root = executables.current.root
     node.binary_name = executables.current.neard
-    node.change_config({"gc_num_epochs_to_keep": DEFAULT_GC_NUM_EPOCHS_TO_KEEP})
     node.start(boot_node=node)
 
     logging.info("Running the current node...")