Add NotImplementedError for angle & bartlett on openvino

[shashaka]

Raise NotImplementedError in the OpenVINO implementation for:

• angle
• bartlett

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.60%. Comparing base (f5171b3) to head (e469bf2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21246   +/-   ##
=======================================
  Coverage   82.60%   82.60%           
=======================================
  Files         564      564           
  Lines       54543    54545    +2     
  Branches     8472     8472           
=======================================
+ Hits        45054    45056    +2     
  Misses       7402     7402           
  Partials     2087     2087           

Flag	Coverage Δ
keras	82.41% <100.00%> (+<0.01%)	⬆️
keras-jax	63.66% <0.00%> (-0.01%)	⬇️
keras-numpy	58.79% <0.00%> (-0.01%)	⬇️
keras-openvino	32.99% <100.00%> (+<0.01%)	⬆️
keras-tensorflow	64.08% <0.00%> (-0.01%)	⬇️
keras-torch	63.73% <0.00%> (-0.01%)	⬇️

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