Added openvino backend support for argmin and argmax (Issue #29011)

[aabernich]

I added the OpenVINO backend support for the NumPy operation argmin and argmax which should close issue #29011.

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[fchollet]

@rkazants please review!

[rkazants]

@aabernich, please figure out why the precommit tests are not run for your PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 80.10%. Comparing base (e045b6a) to head (6598d9d).
Report is 23 commits behind head on master.

Files with missing lines	Patch %	Lines
keras/src/backend/openvino/numpy.py	0.00%	32 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20917      +/-   ##
==========================================
- Coverage   82.26%   80.10%   -2.16%     
==========================================
  Files         561      561              
  Lines       52693    53024     +331     
  Branches     8146     8215      +69     
==========================================
- Hits        43347    42477     -870     
- Misses       7344     8587    +1243     
+ Partials     2002     1960      -42     

Flag	Coverage Δ
keras	79.92% <0.00%> (-2.15%)	⬇️
keras-jax	64.08% <0.00%> (-0.16%)	⬇️
keras-numpy	58.88% <0.00%> (-0.12%)	⬇️
keras-openvino	?
keras-tensorflow	64.56% <0.00%> (-0.28%)	⬇️
keras-torch	64.14% <0.00%> (-0.15%)	⬇️

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[hertschuh]

This was done in #21060