[OpenVINO backend] support tob_k and enable tests

[Mohamed-Ashraf273]

@rkazants
@fchollet
@mattdangerw

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.73%. Comparing base (be9b002) to head (a792656).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21436   +/-   ##
=======================================
  Coverage   82.72%   82.73%           
=======================================
  Files         565      565           
  Lines       55219    55232   +13     
  Branches     8608     8610    +2     
=======================================
+ Hits        45682    45697   +15     
+ Misses       7427     7425    -2     
  Partials     2110     2110           

Flag	Coverage Δ
keras	82.54% <100.00%> (+<0.01%)	⬆️
keras-jax	63.32% <0.00%> (-0.01%)	⬇️
keras-numpy	58.52% <0.00%> (-0.01%)	⬇️
keras-openvino	34.08% <100.00%> (+0.28%)	⬆️
keras-tensorflow	63.73% <0.00%> (-0.01%)	⬇️
keras-torch	63.36% <0.00%> (-0.01%)	⬇️

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