Reindex orchestrator workflow adjustments

[SergeyGaluzo]

This PR is the prerequisite for removing explicit counts from reindex.
Scope of changes:

1. Simplifies logic by removing "early exists" based on zero counts and empty lists when possible.
2. Introduces "transient" dictionaries to facilitate reindex completion management.
3. Simplifies logic to derive final statuses.
4. Eliminates redundant calls to the database to get search param statuses.
5. Improves scalability of getting job status calls.

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