[Clickhouse]Look into removing use of both `statementId` and `statement_id` in queries

[Leobouloc]

Feature Request

Currently, clickhouse queries by id use both statement_id and statementId as tested below.

ralph/tests/backends/lrs/test_clickhouse.py

Lines 59 to 60 in b1ad3c8

	"statementId": "test_id",
	"statement_id": "test_id",

Perhaps this could be simplified to only use one, for clarity.