HoDe.observability instead of State.observability

[dehann]

Hi, @Affie does this need anything else -- i just did edit via browser.

Ah, we forgot to add HomotopyDensity.observability

xref:

• more fixes toward DFG v0.29.0 release IncrementalInference.jl#1920

[dehann]

locally i get the same as before (good result barring two existing failures):

ERROR: LoadError: Some tests did not pass: 1678 passed, 2 failed, 0 errored, 0 broken.
in expression starting at /home/dehann/.julia/dev/DistributedFactorGraphs/test/runtests.jl:21
ERROR: Package DistributedFactorGraphs errored during testing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.80%. Comparing base (22a853e) to head (322f55b).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1234   +/-   ##
========================================
  Coverage    80.80%   80.80%           
========================================
  Files           50       50           
  Lines         2673     2673           
========================================
  Hits          2160     2160           
  Misses         513      513           

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