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.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[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%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.