Add reserved_storage_bytes for replicas

Jan Provaznikrequested to merge
jp-reserved into master

What does this MR do and why?

Add reserved_storage_bytes for replicas

Adds reserved_storage_bytes for knowledge graph replicas, similar to zoekt indexes. Reserved storage is included when counting unclaimed storage space for nodes.

Changelog: added EE: true

DB queries

Query for ordering ndoes by order_by_unclaimed_space_desc: https://explain.depesz.com/s/AMuSr#html

The query is from localhost (the reason is that reserved_storage_bytes column doesn't exist on .com yet).

References

Related to #551093 (closed)

How to set up and validate locally

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Edited by Jan Provaznik

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