perf: improve init lms task time by using settings instead of waffle flags

[Ian2012]

Description

This PR improves the init lms task time by using settings to enable the sinks instead of using waffle flags.

Migration steps

Make sure to drop all event_sink_clickhouse_*_enabled records on the waffle flag admin in the LMS:

• Search event_sink_clickhouse in the admin for the waffle flag model.
• Select all records.
• In the action menu, select the Delete all records action and proceed with the deletion.

[openedx-webhooks]

Thanks for the pull request, @Ian2012!

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[bmtcril]

LGTM