Zoekt indices without zoekt_repositories stuck in initializing

What does this MR do and why?

zoekt_indices which don't have any zoekt_repositories gets stuck in the initializing state. The task mark_indices_as_ready that is supposed to move these indices to ready can not move these indices to ready because the scope used in this task with_all_repositories_ready is moving only those indices to ready which have all zoekt_repositories. It is skipping the indices that don't have any zoekt_repositories.

Rewrite the scope with_all_repositories_ready to with_all_finished_repositories to include the indices that don't have any zoekt_repositories or whose all zoekt_repositories are in the finished states(ready or finished).

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Related to #506635 (closed)