Remove deprecated CK Test validator

[clonker]

No description provided.

[codecov]

Codecov Report

Merging #258 (c83d88e) into main (1729ab7) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
- Coverage   92.29%   92.17%   -0.13%     
==========================================
  Files         141      141              
  Lines       11587    11485     -102     
==========================================
- Hits        10694    10586     -108     
- Misses        893      899       +6     

Impacted Files	Coverage Δ
deeptime/markov/hmm/_maximum_likelihood_hmm.py	93.61% <ø> (-0.53%)	⬇️
deeptime/markov/msm/_maximum_likelihood_msm.py	94.11% <ø> (-0.66%)	⬇️
deeptime/decomposition/_vamp.py	98.34% <100.00%> (+1.20%)	⬆️
deeptime/markov/hmm/_bayesian_hmm.py	94.11% <100.00%> (-0.38%)	⬇️
deeptime/markov/msm/_bayesian_msm.py	92.64% <100.00%> (-1.48%)	⬇️
deeptime/util/validation.py	97.33% <100.00%> (-0.29%)	⬇️
deeptime/util/decorators.py	82.53% <0.00%> (-11.12%)	⬇️
deeptime/markov/_observables.py	96.36% <0.00%> (-1.82%)	⬇️

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