Wrap arguments in Arel.sql in queue_background_migration_jobs_by_range_at_intervals

While working on !17993 (merged) I noticed that there is deprecation warning printed when queue_background_migration_jobs_by_range_at_intervals is used:

DEPRECATION WARNING: Dangerous query method (method whose arguments are used as raw SQL) called with non-attribute argument(s): "MIN(id), MAX(id)". Non-attribute arguments will be disallowed in Rails 6.0. This method should not be called with user-provided values, such as request parameters or model attributes. Known-safe values can be passed by wrapping them in Arel.sql(). (called from block in queue_background_migration_jobs_by_range_at_intervals at ee/gitlab/lib/gitlab/database/migration_helpers.rb:1021

This MR wraps the 'MIN(id), MAX(id)' in Arel.sql to remove the warning.

TL;DR:

-          start_id, end_id = relation.pluck('MIN(id), MAX(id)').first
+          start_id, end_id = relation.pluck(Arel.sql('MIN(id), MAX(id)')).first

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