Revert "427437-preload-autocomplete_sources-members"

What does this MR do and why?

I'm reverting this MR as this is damaged, rebase gone wrong, somehow only two files out of 12 was merged.

Revert "Merge branch '427437-preload-autocomplete_sources-members' into 'master'"

This reverts merge request !139085 (merged)

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