[OpenVINO backend] Support numpy.expm1

[Huanli-Gong]

Details:

• Adds numpy.expm1 function to OpenVino backend.

Tickets:

• Closes [Good First Issue][Keras 3 OpenVINO Backend]: Support numpy.expm1 operation #29358

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.69%. Comparing base (acd6f3c) to head (a0498ea).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21141   +/-   ##
=======================================
  Coverage   82.68%   82.69%           
=======================================
  Files         564      564           
  Lines       54132    54141    +9     
  Branches     8411     8412    +1     
=======================================
+ Hits        44761    44770    +9     
  Misses       7296     7296           
  Partials     2075     2075           

Flag	Coverage Δ
keras	82.50% <100.00%> (+<0.01%)	⬆️
keras-jax	64.06% <0.00%> (-0.02%)	⬇️
keras-numpy	59.08% <0.00%> (-0.02%)	⬇️
keras-openvino	32.90% <100.00%> (+0.02%)	⬆️
keras-tensorflow	64.34% <0.00%> (-0.02%)	⬇️
keras-torch	64.10% <0.00%> (-0.02%)	⬇️

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[rkazants]

Fix this failed job - looks some agreement needs to be signed:

[Huanli-Gong]

Fixed @rkazants

[rkazants]

@Huanli-Gong, can you please do one more extra commit (that does nothing) to avoid sporadic failure in CI with torch?

[rkazants]

@fchollet, looks good to me. Recommend to merge

[fchollet]

Thank you!