Prevent IndexNullState and IndexPropertyLength to be updated

[dirkkul]

What's being changed:

closes #2360

IndexNullState and IndexPropertyLength could be updated for an existing schema. This would create problems as existing objects are not reindexed

Review checklist

• Documentation has been updated, if necessary. Link to changed documentation:

[codecov]

Codecov Report

Base: 68.04% // Head: 68.06% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (e1e37ef) compared to base (68c3022).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff                @@
##           stable/v1.16    #2368      +/-   ##
================================================
+ Coverage         68.04%   68.06%   +0.01%     
================================================
  Files               530      530              
  Lines             53348    53360      +12     
================================================
+ Hits              36299    36317      +18     
+ Misses            14814    14810       -4     
+ Partials           2235     2233       -2     

Flag	Coverage Δ
integration	68.74% <100.00%> (+0.04%)	⬆️
unittests	53.35% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
adapters/handlers/rest/embedded_spec.go	100.00% <100.00%> (ø)
adapters/repos/db/inverted/config_update.go	100.00% <100.00%> (ø)
adapters/repos/db/lsmkv/bucket.go	63.84% <0.00%> (-2.06%)	⬇️
usecases/sharding/state.go	66.40% <0.00%> (+0.80%)	⬆️
adapters/repos/db/vector/hnsw/index.go	58.44% <0.00%> (+0.86%)	⬆️
adapters/repos/db/vector/hnsw/delete.go	77.88% <0.00%> (+1.68%)	⬆️
adapters/repos/db/shard_write_batch_objects.go	77.27% <0.00%> (+2.27%)	⬆️

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