clickhouse: allow restoring experimental MergeTree settings

The two settings were introduced between v23.8 and v24.3. They are needed when
restoring by clusters that have defined them at the table level.

astacus/coordinator/plugins/clickhouse/steps.py

@@ -685,6 +685,8 @@ def _create_dbs(client: ClickHouseClient) -> Iterator[Awaitable[None]]:
             b"SET allow_hyperscan=true",
             b"SET allow_simdjson=true",
             b"SET allow_deprecated_syntax_for_merge_tree=true",
+            b"SET allow_experimental_block_number_column=true",
+            b"SET allow_experimental_replacing_merge_with_cleanup=true",
             # If a table was created with flatten_nested=0, we must be careful to not re-create the
             # table with flatten_nested=1, since this would recreate the table with a different schema.
             # If a table was created with flatten_nested=1, the query in system.tables.create_table_query

tests/unit/coordinator/plugins/clickhouse/test_steps.py

@@ -890,6 +890,8 @@ async def test_creates_all_replicated_databases_and_tables_in_manifest() -> None
         b"SET allow_hyperscan=true",
         b"SET allow_simdjson=true",
         b"SET allow_deprecated_syntax_for_merge_tree=true",
+        b"SET allow_experimental_block_number_column=true",
+        b"SET allow_experimental_replacing_merge_with_cleanup=true",
         b"SET flatten_nested=0",
         b"CREATE TABLE db-one.table-uno ...",
         b"CREATE TABLE db-one.table-dos ...",
@@ -964,6 +966,8 @@ async def test_creates_all_replicated_databases_and_tables_in_manifest_with_cust
         b"SET allow_hyperscan=true",
         b"SET allow_simdjson=true",
         b"SET allow_deprecated_syntax_for_merge_tree=true",
+        b"SET allow_experimental_block_number_column=true",
+        b"SET allow_experimental_replacing_merge_with_cleanup=true",
         b"SET flatten_nested=0",
         b"CREATE TABLE db-one.table-uno ...",
         b"CREATE TABLE db-one.table-dos ...",
@@ -1023,6 +1027,8 @@ async def test_drops_each_database_on_all_servers_before_recreating_it() -> None
         b"SET allow_hyperscan=true",
         b"SET allow_simdjson=true",
         b"SET allow_deprecated_syntax_for_merge_tree=true",
+        b"SET allow_experimental_block_number_column=true",
+        b"SET allow_experimental_replacing_merge_with_cleanup=true",
         b"SET flatten_nested=0",
         b"CREATE TABLE db-one.table-uno ...",
         b"CREATE TABLE db-one.table-dos ...",