Add feature flag for indexing work item notes

Terri Churequested to merge
tchu-add-ff-for-notes-indexing into master

What does this MR do and why?

Corrective action from incident gitlab-com/gl-infra/production#19026 (closed)

Indexing for some work items is being blocked by DB timeouts from preloading notes records.

The initial indexing queue is backed up. The records will never be indexed because the preloading of notes is timing out the database. The advanced search migration framework uses the initial indexing queue for data migrations (this queue is also used for new projects and project imports).

This MR adds a disabled by default feature flag to prevent indexing notes until the preloading can be fixed - that work is tracked in Work items indexing notes causing db timeouts (#508906 - closed)

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Edited by Terri Chu

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