RAFT: support back RF scale increase

[moogacs]

What's being changed:

this PR :

• improve the acceptance tests for replication
• enable back raft replication factor increase, see Disable replication factor increase #4841, disable: assigning local state for replication factor +/- #4851
• resolves Existing replication factor increase implementation does not work with raft #4840

links : chaos pipeline for activate and deactivate tenants

PR #4913

• shards reinit method called initNonVector on nil class, therefore shard's store had no access to props buckets (no bucket for title found errors)
• db update called after class was updated did not change Index::Config replication factor, so replicationEnabled method still returned false - making coordinator node do not propagating changes to replicas, only to itself

Review checklist

• Documentation has been updated, if necessary. Link to changed documentation:
• Chaos pipeline run or not necessary. Link to pipeline:
• All new code is covered by tests where it is reasonable.
• Performance tests have been run or not necessary.

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
2.4% Duplication on New Code

See analysis details on SonarCloud

[reyreaud-l]

LGTM. See the non blockers if you want to change it