Before this change, we registered web_hook_logs for partitioning in the
class, as normal. However this caused a bug if the feature flag
web_hook_logs_daily_enabled was set because the feature flag
changed the table_name read by the partition manager.

Fix this by directly registering both web_hook_logs tables directly in
the initializer, bypassing the feature flag and keeping tables
compatible with both feature flag states.

Fixes https://gitlab.com/gitlab-org/gitlab/-/issues/523921